One of the few surviving examples of the first lock and dam system built on the Ohio River.

Dozens of large-scale, creative, evocative curios from prominent artists dot the calm outdoor space around this major museum.

A secret door leads to this cozy dive that sells only “milk.”

This enchanting green space houses a labyrinth lined with toxic plants.

This enchanting forest trail leads to ethereal abodes and a giant bird's nest.

This former hydraulic laboratory is now a woodland dotted with old engineering models.

A peculiar forest that was handcrafted for government experiments.

This Philly landmark has a giant butterfly pavilion, three floors of insect displays, and withstood a $40,000 heist.

A former 19th-century tavern, famous for its peach brandy and honey concoction.

A mesmerizing wonderland of salt-encrusted tree branches and pencil roots.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

A granite rock formation littered with various species of moss, lichen, and fern.

Journey through the largest remaining peat bogs in the contiguous United States to see the wilderness as it once was.

Locals call this magical moss-covered walkway the "Emerald Path."

A small island with shimmering pink sands, home to loggerhead turtles and rare plants.

This charming woodland trail is peppered with poetry.

This ancient trail climbs the mountain where a Latin League cult worshipped Jupiter, its main deity.

The surviving remnants of a destroyed medieval church now stand in a public park.

The plants form a living library and laboratory for researchers and students at Michigan State University.

This labyrinthine resting place of Black American leaders has been reclaimed by nature.

This muddy wooded valley and the ancient structures it hides are said to be the favored haunt of the legendary Friar Tuck.

This small, unassuming, nursery plays hosts to some unique plant life.

An outdoor urban gallery of large-scale artworks by the world's most influential street artists.

You can walk up Thailand’s naturally non-slip waterfall.