This hidden green space is the city's second largest conservatory.

The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

This free, take-a-book shop seems like a trick but isn't.

Eighteen miniature death-scene dioramas.

A lush green oasis in the middle of Chicago.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

A rare view of a preserved Victorian science museum.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

The best place in New York to pick up the controversial, notoriously foul-smelling Asian "king of fruits."

Beautiful mosaics cover the first stations opened on New York City's newest subway line.

Play heads or tails with thousands of different coins.

The artist and New York City icon lived, worked and died in this converted carriage house owned by another iconic artist, Andy Warhol.

The walls are decorated with whimsical murals painted by the creator of the Madeline franchise.

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

Bowl in splendor, if you're lucky.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

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