A tunnel that brings more than a century of history to life from the deepest parts of the Niagara Gorge.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

One of California's oldest continually used high schools has an interesting history, both on and off screen.

This abandoned five-star hotel is now a five-star urban exploration destination.

This fairy-tale, neo-Gothic church in the Azores is a world of magical realism.

Locals dubbed it the "Owl Building" because of its bird-like appearance.

Air-raid tunnels hidden beneath this opulent hotel provided shelter and an escape route—and one of the world's longest slides.

Memorial to the father of the Republic of China.

An eccentric home stands out in an otherwise average neighborhood with mosaics, mini topiaries, and kinetic sculpture.

Before it was abandoned and left to rust alongside the road, this riverboat starred in a John Wayne movie.

A 19th-century mansion houses the largest collection of gin in the European Union.

Europe's oldest still-operational tea farm also boasts a spectacular view.

Graffiti-covered ruins that were once part of a farm owned by a mental hospital.

This 19th century hydroelectric powerhouse was the first of its kind.

A working miniature city designed to teach kids about safety and presumably city planning.

The capitol city's oldest existing cemetery.

This 15-story mural celebrates the 50th anniversary of the musician's iconic "At Folsom Prison" album.

A mesmerizing disco ball-like sculpture along the Sacramento River Walk.

This 19th century train workshop is a treasure trove of railroad history.

I Street Bridge is the heaviest swinging center bridge in the United States.

A replica of the first public theater built in California.

The California capital city once stood 10 feet lower than it does today.

Art Deco stylings conceal the true nature of this bridge.