There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

This bridge is haunted by the ghost of a distraught mother.

148 feet long and in the middle of a verdant forest.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

When ecosystems collide in the arid Southwest.

This free, take-a-book shop seems like a trick but isn't.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

An abandoned stretch of highway, deteriorating next to the operational one.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

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

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

This woodland architectural installation acts as a camera obscura for the heavens.

Rare recess caves fill this unbelievably beautiful Ohio park.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

Quite simply the largest tree in the world (by volume).

This quirky curiosity shop takes its cues from the world's bazaars.

A historic neighborhood church is reborn as a psychedelic arts collective.

These eerie outliers of the lightning bug family glow a mysterious blue color.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.