Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

The seamy, underground secrets of Portland's criminal past.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A semi-scholarly approach to sex.

Notorious artist squat renovated into legal studios.

Elevated freight railway turned wildly successful urban park.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

These fantastically named natural pools look like something out of a Scottish myth.

Dramatic river bend surrounds a natural red-rocked pedestal.

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

An artsy hidden staircase leads to breathtaking views of San Francisco.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Beautiful views and Roman-style statues on the Italian coast.

Cabaret where the show girls are all androids, and the patrons couldn't be more pleased.

The 10,000 Torii shrine.

A Japanese concept restaurant that feels like a party thrown by the monsters in your closet.

Hot springs monkey spa in the middle of Hell's Valley.

An abandoned whaling station on an active volcano offers hot springs in Antarctica, surrounded by ruined giants of industry.

The best place to send your postcards home from Antarctica.