Barcelona's Sagrada Familia cathedral played host to a memorial mass for the victims of the Barcelona attacks.
Barcelona, Spain CNN  — 

It’s 8 a.m. on Sunday, and as tired partygoers spill out of Barcelona’s nightclubs, a line is forming at Antoni Gaudi’s spectacular Sagrada Familia cathedral – the jewel in Barcelona’s crown.

But these visitors aren’t gathering for a tour; instead they’re waiting to take part in a memorial mass, honoring the victims of a deadly terror attack just a mile away, on the bustling Las Ramblas promenade, the beating heart of a city now in mourning.

Thirteen people were killed and more than 100 injured when a terror suspect mowed down passers-by in the street early Thursday evening.

Meera Andrews, center, waits in line to attend the memorial mass at Sagrada Familia cathedral on Sunday, August 20.

A woman at the front of the queue cools herself off with a black lace fan. Beside her, a man in a crisp white shirt and fedora peers up at a statue of Jesus on the cross.

“This is something we’ve both wanted to see for a long time,” says Meera Andrews, who is visiting the city on holiday from Wellington, New Zealand. The couple had planned to attend the 9 o’clock mass, then realized regular services had been canceled for the memorial.

A group of nuns go through security at Sagrada Familia.

In a nearby apartment block, two shirtless men smoke on their balcony as they look down at the scene below. One floor above, an armed policeman stands watch.

The air is humid, the sky overcast, as the city comes together to grieve.

Spain’s King Felipe VI and Queen Letizia were joined at the mass by Prime Minister Mariano Rajoy, Portuguese Prime Minister Antonio Costa, Catalan leaders and other officials, as well as members of the public.

Cardinal Lluís Martínez Sistach, center, speaks with Archbishop of Barcelona, Cardinal Joan Josep Omella, while awaiting King Felipe and Queen Letizia's arrival.
Spain's King Felipe VI, center, speaks to officials before the mass, while his wife Queen Letizia looks on at the crowd outside.

Inside, a mix of locals and tourists fill the pews, many snapping photographs of the cathedral’s vaulted ceilings and stained glass windows on their cellphones. Large swaths of seats in the back of the cathedral sit empty as the Archbishop of Barcelona, Cardinal Joan Josep Omella begins his homily.

The city’s archbishop says those gathered are a “beautiful mosaic” of society, all united in a common goal: “peace, respect, fraternal coexistence, and love.”

The mass procession begins inside the Sagrada Familia.

Among the congregants were Freda Taah, 31, and Mathew Asuo-Asabere, 33, tourists visiting from Sydney, Australia.

“We had already planned to come to the cathedral, because we’re Christians,” Taah says.

Freda Taah and Mathew Asuo-Asabere were visiting Barcelona from Sydney and attended the memorial mass.

Barcelona is just one of a string of destinations the pair is visiting on a seven-week holiday that criss-crosses Europe. And while they say they want to make the most of their time here to see the sights, they also want to be respectful of the tragedy that struck this city.

“You could feel the unity, you could feel that people wanted to come together in defiance and move on,” Taah said.

READ MORE: Las Ramblas, the attack locals feared was coming

While people prayed for the victims of the attack, outside the cathedral, a long line of tourists hoping to tour the famous landmark began to snake down the street.

Tourists take a group selfie outside the Sagrada Familia.

Annalotta Scheinin, 32, was waiting in the queue with her boyfriend; the couple were on a weekend getaway from Turku, Finland, where Scheinin works as a resident anesthesiologist. Back home on Friday, she was treating victims of another terror attack, which left two women dead.

“Somehow you get used to the idea that these attacks are coming more frequently now,” Scheinin said.

Annalotta Scheinin was visiting Barcelona from Finland, where she helped treat people involved in a stabbing attack in Turku over the weekend.

As the mass ended and the congregation slowly trickled out, Henrique Sposito, 46, gingerly pushed his sleeping son down the steps in a stroller.

Sposito moved to Barcelona from Brazil just four months ago.

“We chose this city to raise our son,” he says, explaining that the city’s liberty, multicultural energy, and safety were what attracted him and his wife here.

Henrique Sposito checks on his son Davi in a stroller outside the Sagrada Familia.

Their extended family was visiting from Brazil on Thursday when the attacker struck.

They were walking on a street adjacent to Las Ramblas when a crowd of people started sprinting towards them. Sposito grabbed his elderly mother’s arm and his son’s stroller, and rushed into a nearby restaurant.

“People were running like it was a bullfight,” he said.

READ MORE: Bomb factory in beach town key to terror attacks

Sposito, who lives two blocks away from the Sagrada Familia, had come to the nearby Placa de Gaudi park to play soccer with his son, but decided to go to the memorial instead. One-year-old Davi was resting his head on a Barcelona Football Club ball, fast asleep.

The sun breaks through dark skies over Sagrada Familia on Sunday morning.

“Probably the security is going to be more vigilant for some time, but look at this, we are here today and saw a king. It’s the first time I see a king,” he laughs.

While the country’s terror threat level hasn’t been raised, the heightened security here is palpable. Nearby, police patrol the streets carrying assault rifles. Two men were pulled out of the crowd of tourists and searched.

Police and fire vehicles parked outside the cathedral.
Authorities pat down a man across the street from Sagrada Familia, while mass carries on inside.

Tensions are also running high in the city’s Gothic Quarter, where people have set up several makeshift memorials for the victims along Las Ramblas. Impromptu waves of applause break out every few minutes as hundreds lay flowers, light candles, and leave mementos.

Chants of “Barca, Barca, Barca,” ring out as a group of FC Barcelona fans huddled in a tight circle at Plaza Catalunya, where the attacker’s deadly rampage began.

A man hoists a boy in a Barcelona football jersey above a large crowd gathered at the spot where the attacker stopped his deadly rampage.

Many people have posted messages of solidarity, written on sticky notes tacked onto market stalls, and scrawled on the silver plane trees that shade the boulevard.

Rosa Barahona, 22, was sitting writing notes in meticulous handwriting, while her younger sister Lucia Darriba, 13, and mother Alicia Alvarez, 46, both holding roses, chatted on a bench.

Candle wax melts down the curb at a makeshift memorial on Las Ramblas in Barcelona, where the van attack killed 13 people on Thursday.

Barahona read one of her messages aloud: “Barcelona is pure … It loves its people … Barcelona laughs and grows with them, disregarding their nationalities, all of us are their people … Barcelona loves us.”