Visitors to this arboretum are greeted by three smiling giants crafted from sustainable materials.

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

The world's longest known cave system.

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.

A historic coal mine that doubles as a museum and tourist attraction.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

The tallest waterfall in West Virginia.

Soak in the sacred vibes at this beloved food and coffee hangout inside a former church.

Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

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

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

Time travel with sweets across history at this research-based candy store.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

Amid the hustle and bustle of Miami’s Financial District sits a mausoleum-turned-monument.

Twenty-three trees, each paired with a basalt stone, line a street in Chelsea, continuing an urban project started by German Fluxus artist Joseph Beuys.

A 19th century hat factory still stands as a crumbling ruin in upstate New York.

Home to the abandoned Tioronda Hat Works Factory, this park is a combination of woodlands and marshlands.

A unique collection of figures perform down the facade of the Gene Frankel Theatre.

A terrific purveyor of natural history objects and curios.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

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

Storage warehouse of the rich and famous.