A uniquely lettered street sign marks the corner where the iconic word game was invented.

Piano-making empire filled with 200-year-old steam machines still churning out 1,000 instruments a year.

World's oldest operating science fiction and fantasy club, once home to Ray Bradbury and L. Ron Hubbard.

Space program, pneumatics and more, bits and pieces, for movie sets or the common man.

This stockpile of junked electronic and mechanical gadgets is a favorite among Hollywood prop masters.

Hidden in the hills of Hollywood, this secluded Oz-themed garden is dotted with dozens of thrones.

America's most famous piece of self-built architecture.

Rummage through this sunken ship, but leave your scuba gear at home.

Stockholm's deepest subway station is also a stunning ecological wonder.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

The world's largest model of our planetary system.

The library's graceful rotunda is like a bibliophile's temple.

It houses the remains of a 17th-century version of the Titanic.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

This translucent sculpture represents a quintessential component of New York City's skyline.

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

A botanically themed auditorium blooms within the world’s last operating double-decker theater.

It was once the base for a series of domestic terror attacks.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

People escaping slavery may have hidden inside a corpse vault.

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

Dedicated to the history and culture of smoking, this small museum now includes a vape lounge.