A crane lifts the final piece of the 17 meters high and 13.5 meters wide cross that completes the Sagrada Familia`s Tower of Jesus Christ in Barcelona on Friday.Lluis Gene / AFP - Getty Images

Barcelona`s towering Sagrada Familia basilica reached its maximum height on Friday, though the magnum opus of Catalan architect Antoni Gaudí remains years away from completion.

A crane placed the upper arm of a cross atop the Tower of Jesus Christ, the church`s soaring central piece, which now stands 172.5 meters (566 feet) above the city, the church said.

With Friday`s addition, the Sagrada Familia inched closer to being done. The unfinished monument became the world`s tallest church last year after another part of its central tower was lifted into place.

The first stone of the Sagrada Familia was placed in 1882, but Gaudí never expected it to be completed in his lifetime. Only one of its multiple towers was finished when he died at the age of 73 in 1926, after being hit by a tram.

In recent decades, work has sped up as the basilica became a major international tourist attraction, with people enthralled by Gaudí`s radical aesthetic that combines Catholic symbolism and organic forms.

A crane lifts the final piece that completes the Sagrada Familia`s Tower of Jesus Christ in Barcelona on Friday.Lluis Gene / AFP - Getty Images

The inside of the Tower of Jesus Christ is still being worked on. Its exterior is flanked by construction cranes and scaffolding.

Still, topping the central tower, which soars above the transept, has been a priority ahead of celebrations this June that will mark the centenary of Gaudí`s death. The scaffolding surrounding the central tower is expected to be removed by then, in time for the inauguration of the Tower of Jesus Christ, the church said.

As Gaudí had planned, the cross has four arms so its shape can be recognized from any direction, said Sagrada Familia`s rector, the Rev. Josep Turull. If Barcelona`s city government will allow it, the original plan also includes a light beam shining from each of the cross`s arms, symbolizing the church`s role as a spiritual lighthouse, he added.

Millions of tourists visit the Sagrada Familia every year, and entrance fees largely fund the ongoing construction.

This year, the Sagrada Familia will hold several events to celebrate the Catalan Modernist`s legacy, which includes other stunning buildings in Barcelona and elsewhere in Spain.

The Sagrada Familia became the world`s largest church last October, when it rose above the spire of Germany`s Ulmer Münster, a Gothic Lutheran church built over more than 500 years, starting in 1377. That church tops out at 161.53 meters (530 feet).

At Sagrada Familia, a prayer verse is included at the base of the cross installed Friday afternoon, said church rector Turull.

It reads: "You alone are the Holy One, you alone are the Lord, you alone are the Most High."