The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

An experimental, automotive replica of Stonehenge.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

An ancient cave system in Tennessee’s Appalachian foothills converted to a 1,200-person music venue.

This architectural triumph is the only Frank Lloyd Wright house in Alabama.

A 56-foot tall statue of the god of fire looks out over Birmingham, Alabama.

In Rickwood Caverns, visitors can travel hundreds of feet underground and see beautiful formations unique to the region.

The largest source of fossilized insects anywhere.

Small church on top of a huge rock column.

The true meaning behind this sculpture remains unknown.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

To enter the lower hall of this temple, you must first walk through a dragon.

This massive mural by famed pop-artist Keith Haring was hidden for almost 30 years until its 2018 rediscovery.

The tea room that pushed the boundaries of adorable straight into...we can't find the words.

The behemoth beasts engaged in an epic battle is the second-tallest statue in the contiguous United States.

Georgia's answer to Easter Island immortalizes the nation's great poets, artists, and leaders in stone glory.

Bacteria and algae give the salty water its bubblegum hue.

This quirky local sculpture is quite literally a fish out of water.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."