This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

The picturesque southern city served as the zombie-filled town of Woodbury in 'The Walking Dead.'

A museum celebrating rare American motorcycles where everything runs—and none of it quietly.

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

This fairy tale-themed amusement park is now abandoned, and childhood metaphors abound.

The remnants of an early American attempt at missile defense.

A crumbling hospital from the 1850s on Roosevelt Island.

This former luxury resort in Kaua'i is now an abandoned relic.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

A glimpse into early 19th-century education.

Bizarre Cavern.

A museum dedicated to "science, history and the arts" little changed since 1915.

The 32nd president's sprawling cottage sits on an island enclave jointly managed by the U.S. and Canada.

The largest hand-carved, outdoor sculpture collection in the state of Maine.

A small Canadian town founded as a refuge for Loyalists following American Independence.

This waterfront museum in Maine is dedicated to the history of the smoked-herring trade.

A small park commemorates the departure of the first-ever successful transatlantic balloon voyage.

An ever-changing gathering of crude wooden figures haunts the St. Lawrence River.

Steam engines and conveyor belts are remnants of a genius system left in the middle of the Maine woods.

The second-oldest garden cemetery in the U.S. was also a college brainstorm spot of Stephen King.

The United States' first transcontinental automobile road came to its end at this spot in San Francisco's Lincoln Park.

Largest institutional collection of tomb figures from Western Mexico in the United States.