Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

This bright yellow relic is the final survivor of a short burst of seashell-shaped petrol pumps.

Follow the steps, and this roadside artwork will teach you how to dance.

A playground inspired by differential calculus dangles from the ceiling of the Liberty Science Center.

This Connecticut chapel is a starkly modern, and surprisingly colorful, architectural rebel.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

Ice cream stand, snack bar, and time capsule of milk conveyance.

A real plaque marks the spot where a Faulknerian character committed fictional suicide.

Ship skeletons haunt Baltimore's waterways.

This strange, big-tailed beast became a Pennsylvania town's unofficial mascot.

This jail which was in service for over a century is now open for curious visitors.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

Alexander Hamilton’s creation caused quite a bit of controversy.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

The first American department store, and home to the largest operating musical instrument in the world.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

World's first "penitentiary," meant to be humane, drove men insane.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

A layered tribute to the work of mosaicist Isaiah Zagar.

A crumbling hospital from the 1850s on Roosevelt Island.

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

One of only two commuter aerial tramways in the United States.