At 207 feet, one of the world's longest continuous escalators.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

This dramatic rail curve was once the target of a failed Nazi attack.

There aren't too many operational funiculars around, but Pittsburgh has two!

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

A toxic ghost town sitting atop a massive coal fire.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

These locks on North America’s oldest canal are named after a porcine rock formation.

This inexpensive lodging house was once a prison notorious for its inhumane practices.

Canada's subterranean Cold War museum has doubled as a movie set.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

See some of the world's greatest racing horses at this idyllic thoroughbred breeding facility and garden complex.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A daily replay of the experiment that proved the rotation of the Earth.

This elaborate towering structure was once famed for its revolutionary height.

The world's largest fully steerable radio telescope.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

This rural community has attracted both scientists and techno-refugees due to its federally-mandated lack of technology.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.