A Manhattan Episcopal church with an eerie underground crypt.

More than 250 sakes are available in an izakaya hidden in the basement of a Midtown office building.

Hidden in one of New York's oldest subway stations is the final remnant of the site of the bizarre Shakespeare Riots.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

A whimsical, but often overlooked clock in Park Avenue.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

Wine bottle sculpture with a ship's stateroom inside.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

This semi-hidden Manhattan restaurant is based out of a loading dock.

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

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

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

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

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

Though difficult to access, this stunning cave has a place in Scotland's poetic history.

This once-majestic, now-abandoned Victorian castle has seen better days.

The sign announces the Scottish village's cosmic connections, as it's twinned with Glenelg, Mars.

An abandoned tank sits in an empty London lot as a symbolic middle finger to local city planners.

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

A commemorative plaque at the door pays tribute to an "American Patriot" known for his betrayal.

London's Victorian Tower of Babel.

This sculpture, residing in a quiet corner of a London park, honors the victims of 9/11.

Murals of the wild parties once held on the frozen River Thames.