The "Seinfeld" diner.

New York City's smallest piece of private property.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

A dilapidated dock tells the story of Titanic's missed arrival.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

A semi-scholarly approach to sex.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

New York's oldest magic store.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

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

An artsy hidden staircase leads to breathtaking views of San Francisco.

Cairns built to bring travelers good luck stretch across the land like miniature stone mountains.

Climbing Iceland's highest peak on the rim of the Oræfajökull volcano.

This stunning concert hall has become a symbol of Iceland's national recovery.

This mountain fissure hides a secret path to a secluded mossy grotto within the rock itself.

An old abandoned pharmacy building in Texas is brimming with collectibles and images of the little tuxedoed pooch.

Craggy concrete faces are hidden in the walls of this artificial cave along the San Antonio River.

A museum preserving one company’s history of preserving food.

Last residence of H.P. Lovecraft featured in his story "The Haunter of the Dark."

Century-old shop, specializing in Occult products.

Huge masonic hall in Philadelphia with lavishly themed rooms.

Where America's first doomsday cult awaited the end of the world.

A layered tribute to the work of mosaicist Isaiah Zagar.