An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

This building contains a door only used by members of the royal family.

A naturally mummified 2,000-year-old man.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

A line of blue paint marks the route of the inaugural parade.

A secret climbing tree hides along the side of a Costa Rican road.

The competition: breathe deeply as long as you can.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

One of the last Jazz Age "Wonder Theaters" in New York City.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

The oldest surviving synagogue in New York City is now a soaring art space.

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.

More gold than anywhere else, ever.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

The world's largest indoor go-kart racetrack is hiding in Connecticut.

The ruins of an abandoned 18th-century town that is slowly being reclaimed by the forest.

The ancient past meets the retro-future at these dinosaur tracks that are protected by a geodesic dome.