A battle between nature and architecture in the Cambodian jungle.

This magnificent Cincinnati graveyard is also a popular public park.

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.

This large Sitka spruce that appears to be floating in mid-air, has defied logic for years.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

"The most colorful grottoes of the world.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

Walk through spectacular aisles of hanging meat and wagon wheel–sized cheese at the world's largest wholesale food market.

This semi-spooky remnant of an abandoned hotel provides fantastic views.

This lovely university observatory continues to sit abandoned since its potential savior was sent to jail for fraud.

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

The world's largest key collection features keys to the White House, Frankenstein's castle, and Hitler's bunker.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

Despite being burnt down multiple times, the ruins of this South Carolina church are still standing.

Steaming blood-red hot spring from hell.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Historical figures from New York City's Catholic community reside in Midtown.

Lost subway station nestled beneath Toronto's busy commuter line.

Roman ruins top white travertine terraces formed by ancient hot springs.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

One of the Eight Wonders of Kansas and the first official National Natural Monument these stark formations look like nature's Stonehenge.