These rose marble urinals are the most luxurious loos in Liverpool.

This was the second largest mercury mine in the world and one of the oldest preserved mine complexes in Europe.

Underneath downtown Lincoln resides a network of caves that was also the city's first brewery.

This miniature village stays behind in the Breuer Building, even as the museums around it come and go.

Fake subway tiles were installed to cover a design that resembled the Confederate flag—it's unclear if the resemblance was intentional.

If it hadn't been caught in time, a flaw in the design of this Manhattan skyscraper could have led to its collapse.

A remnant of the original World Trade Center complex continues to serve as a commuter gateway.

The façade of this building looks like a bingo board, but it's really a giant clock by a famed graphic designer.

The only gallery in New York dedicated to olfactory art and the exploration of scent in art.

Though the case is scorched and the buttons half-melted, this hardy handheld gaming device can still run a game of Tetris.

Amid skyscrapers and traffic exists this unique aquatic ecosystem.

An institution dedicated to the towering buildings that make up skylines in New York City and around the world.

The only subway station in the city that still makes use of gap fillers.

Home to a dizzying array of letterpress blocks with a rich history.

A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

An homage to Jackie Gleason's bus-driving character from 'The Honeymooners.'

A touching tribute to the "Queen of Soul."

The lesser-known Alice sculpture of Central Park dedicated to the “godmother of American children.”

The best way to get a sneak peek at the movies.

An aptly-named street near the birthplace of the modern LGBT rights movement.

See Hoover Dam and the bypass bridge from a perspective usually off-limits to the public, and float the upper part of the Black Canyon National Water Trail.

Outstanding taxidermy dioramas showcase the grandeur of the continent's wildlife with spooky realism.

The former home of the reclusive "Weird Wendels" who dominated New York real estate a century before Donald Trump.

The natural hot spring that was integral to the creation of Canada's first national park.