This magical place built as an astronomical center starred as a James Bond villain's lair.

The colonial city's social history is reflected in its fanciful door knockers.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

A Hawaiian stairway to heaven—that you can't climb.

An authentic replica of an Asian temple and garden hidden amongst the natural beauty of Hawai'i.

This WWII plane died a quiet death, and is now a garden eel playground.

Doris Duke's lasting collection of Islamic Art, hidden in a Hawaiian paradise.

A true treehouse near Hawai'i Volcanoes National Park.

The island of Lanai in Hawai'i is a paradise for cats and cat lovers.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

A secret meeting in this small cottage changed the course of British history.

This local gem houses the largest collection of pre-Raphaelite paintings outside of the U.K.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

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

A famous songsmith's custom piano, dubbed "High Society," is hidden just out of sight in one of New York's finest hotels.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

Become a prohibition rebel.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

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

A miniature rainforest is growing inside of a Midtown Manhattan office building.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.