An abandoned World War II bunker is part of a chain that runs throughout Washington.

A tunnel with windows, so you don't miss out on the impressive views.

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

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Stroll through a wonderland of stupendous moss-covered trees.

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.

The unbelievably opulent home built for an infamous newspaperman.

This black shoreline is made up of exploded lava particles.

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

Commonly referred to as the most photographed Victorian home in the United States.

An unusual round church in London with a Templar past.

In Twickenham sits a small whitewashed castle that inspired Mary Shelley's 'Frankenstein.'

Most-visited and most-photographed slot canyon in the American Southwest.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The colorful, smiling concrete silos of Vancouver.

This expansive bridge in the Canadian wilderness was originally just built for friends.

One of Mexico's least-visited archaeological sites is tucked away inside a theme park.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

One of the oldest producers of hand-folded fortune cookies still uses its original secret recipe.

San Francisco's newly reopened hands-on science museum.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A poignant museum dedicated to the history of the Dutch resistance against Nazi occupation