Ride the subways of yesteryear.

A New York garbage depot holds a secret collection of weird and wonderful refuse.

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

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

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

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A terrific purveyor of natural history objects and curios.

The last remaining 19th-century tenement from Boston's old West End neighborhood.

America's original house of worship for Spiritualism, the religious movement based on communing with the dead.

A huge musical instrument played by the ocean.

Created in 1972, the famous sculptor's intricately detailed monument to San Francisco is overflowing with city landmarks.

A 140-year-old castle with underground caves hidden in San Francisco.

A 1920s speakeasy that had rum runners racing up and down the shores of California.

A library and museum dedicated to typography.

The world's first and only museum dedicated to dachshunds.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.

This 8th-century Bavarian monastery is home to an exquisite Baroque-era library.

Taxidermy and miniatures come together to create this unique museum.

Installed at a chaotic intersection, this gave London traffic cops a place to hang their heavy woolen coats.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

Over a decade ago, painted penguins mysteriously appeared around Berwick-upon-Tweed for no apparent reason.

A whimsical sensor instrument for Minneapolitans to play on their walks to work.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.