This partially completed dam was simply abandoned after nearly destroying the city it was built to service.

This tiny island is home to the world's largest colony of Northern gannets.

You'll find rocket launchers, not rollercoasters, at Russia's “military Disneyland.”

A beautiful waterfall and beach where precious stones are plentiful.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

The site of the "Bone Wars" between two rival paleontologists during the dinosaur rush of the 19th century.

Claude Monet immortalized this medieval bridge in two of his paintings.

This fortress played a key role in the battle that would ultimately give rise to the Maratha Empire.

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

The span is crooked and made from two older recycled bridges.

This lovely pocket park is one of the most under appreciated in D.C.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

The national park was once a plantation estate.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

When it opened during the final years of the embargo, all the drinks and cigars were free.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

A terrific purveyor of natural history objects and curios.

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

Visitors are welcome to enter this lush Key West sanctuary to entertain its plethora of rescued parrots.