In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

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

Copenhagen's celebrated theme park and gardens.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

A symbol for the opposition to nuclear power around the world.

Preserved "bog person" that is over 2,000 years old.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

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

One of the now-less-hidden floral gems of the "Emerald Necklace."

Yo, Adrian!

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

A layered tribute to the work of mosaicist Isaiah Zagar.

‘Bush the old fire dog died of poison July 5th, 1869. RIP.’

A line of blue paint marks the route of the inaugural parade.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

Perhaps the most scandalous statue of America's first president.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

Washington's iconic carousel has a nice piece of Civil Rights history.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.