The world’s highest ski resort was deserted after an 18,000-year-old glacier melted away.

This nine-story building can be played like an instrument.

Play heads or tails with thousands of different coins.

The notorious headquarters of a corrupt political machine.

Commemorating the spot where the famous scientist fed his pigeons.

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

Everyone from Mark Twain to Teddy Roosevelt has a pipe hanging from the walls of this historic chophouse.

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

A DIY art gallery/music venue/lecture hall dedicated to video game culture.

The oldest bibliophilia club in America, with exhibitions on historic books and graphic arts.

A hands-on traveling collection of the innovative devices of yesteryear.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

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

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

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

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

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

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

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

Tucked in the back of this amazing antique store is an important piece of medical history.

A terrific purveyor of natural history objects and curios.

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