The busy transport hub is home to the tallest airport slide in the world.

This $62 million dollar temple was erected to house one little dental fragment of religious history.

Singapore's landscaping project is home to 18 incredible Supertrees.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

Five candy-colored villages on the Italian Riviera.

Architectural monsters are devouring this palace's every door and window.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

Stalactites and stalagmites in a beautifully lit cave.

This basilica is dedicated to two saints, one of which is known more for his famous quote.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

The first Russian Orthodox church in the Catholic city of Rome in almost a thousand years.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Architectureal fantasy quarter of Rome.

A subterranean display of public art and architecture.

This century-old cinema house has a marquee that has been hand painted by a single man for over 25 years.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Unusual building appears to be haphazardly built from randomly piled bricks.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

A colorful piece of contemporary art cheerfully clashes with Lyon's historical architecture.

Hundreds of hidden passageways weave through the old quarters of Lyon.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.