Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

This innocent-looking townhome is actually a subway exit.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

A student driver's nightmare.

The Twisted Trees of Alticane are an unnerving grove of Quaking Aspen, apparently mutated from a single source, giving them a twisted and unnatural appearance.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

Where beautiful signs live on forever.

A museum befitting the city responsible for supplying the majority of the world's LSD.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

Floating pink tap installed for a flower show in London.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

An accidentally hidden library containing the ephemeral history of New York.

No one really knows how these old hobby horses got here, but the herd keeps growing.

This pun was simply waiting to come to life, and one defense contractor made it so.

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

In Washington's Yakima Valley lies a town "where dinosaurs roam."

A fine, large-aperture telescope available for public use.

A collection of colorful dinosaurs hidden in an actual rainforest.

The world's only museum devoted to the wonders of fluorescence.

A house filled to the brim with oddities and curiosities.