Elevated freight railway turned wildly successful urban park.

Home to the deepest rift anywhere on Earth.

This two-room shotgun shack in Tupelo is the birthplace of a King.

Kentucky, Tennessee, and Virginia meet at this point in the Cumberland Gap.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

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

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

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

Home to items never before seen by the public.

The site of the climactic scene from the classic horror film is now a historic landmark.

A miniature city, once ruled by the Queen of the Netherlands.

Now containing the bones of the actual conquistador, instead of someone else.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

The Uros people live on floating reed islands in lake Titicaca.

On this tiny spot of land in the middle of Lake Titicaca the only ones who do the knitting are the men.

A valley of unique erosion patterns lends to a view like nothing on Earth.

Popular tourist destination where witches in dark hats sell dried llama fetuses for good luck.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

The famous boat that once ferried Bogart and Hepburn still floats in Key Largo after being abandoned for years.