Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

This small chapel is built of human bones and decorated with a golden skeleton.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

This Bangkok high-rise looks like a rudimentary LEGO elephant.

A small statue of child Jesus given by Magellan in 1521

This holy site either displays a centuries-old cross or a complete fake.

A patch of Philippines forest devoted to saving the lives of an emotionally sensitive species of googly-eyed primates.

Bohol's mysterious brown hills.

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

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

Take a hidden path to the mouth of the cave to watch millions of bats swarm at sunset.

One of the biggest markets in Asia, under one of the continent's largest domes.

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

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

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Historic medieval fortified city in southwest France.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

This futuristic German television spire is actually the world's largest digital clock.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

A tiny church on a man-made island in the Adriatic.

A musical instrument played by the sea.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.