This former coal gasification plant found a curious second life as a popular public park.

The longest and widest floating bridge in the world.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

A giant Troll lurks under one of Seattle's oldest bridges.

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

The only structure left with direct ties to the Salem witchcraft trials of 1692.

An enormous, inside-out glass globe built in 1935.

An abandoned 146-acre summer resort slowly being reclaimed by nature.

This picturesque Victorian ghost town was once a thriving mill community.

The Connecticut village named for its subterranean thunder.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

From bench to vandalism to art, this silly prank seat was funny enough to become permanent.

Commemorating the 1948 creation of the Jimmy Fund, a Boston-based cancer charity.

An anonymous art project beneath Longfellow Bridge where hundreds of trophies line the steel support beams.

A luxury hotel constructed out of a former jail.

The Boston home of a conductor on the Underground Railroad.

Former home of an abolitionist couple who escaped slavery and established the most active Underground Railroad stop in Boston.