Cryptic messages embedded in the New York City sidewalk.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

This recently uncovered ad for Lindsay's run at Mayor in 1965 had been hiding for decades underneath a billboard.

The story of a Floridian city as told through an obscure sport for retirees.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

This inanimate goat created by the "welding nun" has been helping to clean up the city of Spokane for more than 40 years.

This playground sculpture of an icon from the past is dedicated to the children of the future.

There are owls with glowing eyes in Herald Square.

The curios of pharmacist and collector Henry Wellcome.

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

A Collegiate Gothic quadrangle that surrounds an 18th century secondary school whose financing came from the likes of Alexander Hamilton and Aaron Burr, among others.

Michael Jackson got Bad and Crocodile Dundee walked on heads in this iconic Brooklyn subway station.

A library and shop devoted to the body, mortality, and bringing to light forgotten or neglected histories

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Tucked in the back of this amazing antique store is an important piece of medical history.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.