Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

One of the last full-orchestra recording studios in New York City and an acoustical marvel.

Mine your own precious stones.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

James Turrell's total color immersion art installation, hidden on the top floor of a luxury handbag shop.

The rocks of a certain area of Butte, Montana give off a musical ring when hit.

Bridges, terraces, and replicas of historic structures all built of rock and petrified wood by one man.

The historic bar where local ship captains, traders, and gold miners would come together to do business a century ago.

An American city stranded at the tip of a Canadian peninsula where strict adherence to the "49th parallel rule" became problematic.

Cave carved out of a huge snow drift collapsed killing one and injuring five in July 2015.

A fine, large-aperture telescope available for public use.

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

Rummage through this sunken ship, but leave your scuba gear at home.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

The last remnants of what was once one of the world's grandest hotels can now be found in a Manhattan subway station.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

Everyone from Mark Twain to Teddy Roosevelt has a pipe hanging from the walls of this historic chophouse.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

An unassuming secret door once led to a legendary watering hole.

A very classy 1920s-era bar right in Grand Central Station.

A Manhattan office building is home to the world's largest chess board.

Read a book next to a Midtown waterfall.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

Wine bottle sculpture with a ship's stateroom inside.