Ha Long Bay's "Cave of Surprises" houses a popular phallic rock formation.

A once grand hotel is being retaken by the wilderness it once capitalized on.

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

A reservoir of vintage pinball machines and arcade games for the nostalgic and thrill seeking.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

A hidden architectural treasure in New York's Brooklyn.

A tree that grows parallel to the ground was declared Brooklyn's "crowning curio" by the poet who saved it.

Sniff the Titan Arum's rotting flesh.

Headquarters of the world's fourth largest Hasidic sect and the first of many "770s" around the world.

A terrific purveyor of natural history objects and curios.

A crumbling hospital from the 1850s on Roosevelt Island.

19th century cemetery hidden in Brooklyn's Prospect Park.

The ancient tomb acts as a calendar that keeps perfect time.

A bizarre house filled with an astounding array of collections.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

A former seaside jewel built for the everyman is now simply a neglected art deco fortress.

Shipwrecks, ruins, and turtles are all that remain on this haunting Caribbean ghost island.

Ho Chi Minh's perfectly preserved body has been on display here since 1975.

World's first "penitentiary," meant to be humane, drove men insane.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A reliquary of pop culture marvels, including the world's largest (and most terrifying) Jack-in-the-Box.