A forgotten relic from New York's bygone trolley system hides in plain sight under a bridge.

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

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

A crumbling hospital from the 1850s on Roosevelt Island.

This metal eagle one of the final remnants of a newspaper that wanted to keep Brooklyn to Brooklyn.

This striking arch, one of the first architectural elements constructed in Prospect Park, was recently restored to its original glory.

This once-abandoned mansion is now a dreamy event space.

In Coyoacán, a pair of coyotes crown a public fountain in reference to the ancient Aztec name of the borough.

One of the largest carillons in the world, this giant instrument has 67 cast-iron bells played by a keyboard.

The remains of one of America's first radiation testing grounds still rest ominously in a Georgia forest.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

A white oak with property rights.

Giant instrument-shaped home in Fayetteville, Georgia.

A vision of beautiful Hindu architecture in the middle of the American South.

One-of-a-kind museum inside the first Boeing 747-400 ever made.

An unusual art exhibition in a suburban yard is designed to awaken the souls of those flowing by.

An underground magnet for ever-changing street art.

Scattered around Atlanta are little doors with big charm.

Atlanta's strange assortment of concrete pillars inspires reflection in some, confusion in others.

A colorful square marks the heart of the city's LGBTQ community.

The small first-floor apartment where the author wrote her Pulitzer Prize-winning book 'Gone with the Wind.'

A man's home is his castle.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

Bizarre Cavern.