In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

An underground magnet for ever-changing street art.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

With well over 130 falls and cascades to brag about, Hamilton, Ontario has earned its stripes as the waterfall capital of the world.

The third version of this tall sailing ship sits, rusted and burnt, in Lake Ontario.

Where the oil industry began.

A geological mystery on Camelback Mountain.

The biggest solar telescope in the world helps reveal the secrets of our sun.

A spiritual vortex among the red rocks in Sedona.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

The world's largest moose statue is located (where else?) in Canada.

This collection of historical artifacts and tropical wildlife waits just beneath the surface of the water.

A glowing underwater cliff attracts marine life and divers in equal measure.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

This tiny tropical village was sick of anonymity so the locals made this sign, which actually changed the name of the town.

Khmer Rouge's high security prison.

Macabre astrological automaton clock dating to the late 1400s.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Op-art architecture designed for happiness.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

A tiny church on a man-made island in the Adriatic.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.