A church filled with the bones of hundreds of virgins martyrs—or so they say.

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

A hotel and restaurant serving as the mecca of kitsch.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

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

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

This "floating railway" is one of the world's oldest monorail systems.

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

Twisted buildings adorn the banks of the Rhine river.

Largest illuminated advertisement sign in the world.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

One of the largest crucifixes in the world stands 55 feet tall in a secluded, wooded area of northern Michigan.

World's largest Christmas store.

The largest earthwork effigy in the world.

An office built to look like a giant basket.

This presidential tomb was not dedicated until years after Harding's death due to personal controversy.