Small on the outside, big on the inside, this church is an astonishing act of visual deception.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

France's most famous cemetery, with some of its most curious tombs.

The oldest botanical garden in the world that technically isn't the oldest.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Go inside to really appreciate this 500-year-old technological masterpiece.

Pilgrimage site for star-crossed lovers.

A military museum, art park, mausoleum, and architectural oddity all on one fascist's estate.

Remnants of cone-shaped fascist bomb shelters in Milan.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

A fake medieval village in the middle of Turin.

An unsettling painting of three faceless sisters that is surrounded by history and legend.