Reforestation in action is the main attraction in this abandoned quarry.

A medical facility that has been kept frozen in time.

This hidden stream beneath Indianapolis makes an appearance in the best-selling novel "Underground Airlines."

This disastrous New Jersey safari park saw animal attacks, escapes, and disease before being abandoned.

A planned settlement in Pennsylvania once housed the aristocratic refugees of the French Revolution.

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

This set of rickety spaceships are prepared to give alien travelers a place to relax and go to the bathroom.

This kitschy tavern is also home to rare early editions of "Treasure Island."

A pink and gray pair of pachyderms advertise a fireworks shop.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

One of the oldest living oak trees in the Southeast.

The world's largest fire hydrant is supposedly tornado-proof.

This psychedelic tromp l'oeil seems to be beckoning drivers to crash into a wall.

This titanic steel chain linking two buildings was installed without permission but instantly beloved.

A vast collection of rare books, manuscripts & extraordinary objects illustrating the history of medicine.

An archival collection of over 2,200 case studies which includes human brain specimens and tumor specimens.

137 graves holding New England's earliest residents.

The headquarters of the famous Yale society.