Europe’s most powerful hot spring supplies the surrounding region with hot water.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

The biggest drug trafficking passage between Mexico and the U.S.

Belly up to the bar in Cowtown, don't forget to buy some boots.

A serene temple with stunning stained glass hides in downtown Dallas.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

A modernist landscape of water and sci-fi concrete.

The reconstruction of this prominent building fulfilled a long-written command.

This fountain was once heralded as the largest in the world.

This scenic Icelandic lava flow is named for a pair of Berserkers who were murdered, according to a famous Saga.

This building was once a town hall, a fire station, a prison, a dairy market, and the target for two marksmen.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

This quaint Hungarian railway system is operated exclusively by children between the ages of 10 and 14.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Singapore's landscaping project is home to 18 incredible Supertrees.

Across this single-file rope bridge is what has been claimed to be the edge of continental Asia.

Glasgow's own "tipsy" temperance monument.