An underground wonderland in Iowa.

This rocky outcrop served as a quarry for some of the bluestones that sit at the center of Stonehenge.

This huge coastal nature reserve in Wales was a stand-in for the Arabian Peninsula in 'Lawrence of Arabia.'

The great American road trip, but smaller.

How did the 110-foot limestone statue cross the road?

According to legend, King Arthur killed a beast that dwelled beneath the waters of this Welsh lake.

The last sailing lobster boat in Maine is also likely New England's first zero-emissions commercial vessel.

A display of everyday life in the area that was unveiled during the 2012 Summer Olympics.

A faded reminder of what was once a common sight in London during the Blitz.

The remains of Crystal Palace Great Exhibition of 1851.

A piece of baseball history is preserved in a Pittsburgh parking lot.

These artificial caves crafted by ancient Romans were elaborate fish farms for moray eels.

Generations have refused to move this doll from its dusty resting place to preserve a castle from a watery fate.

These tracks are believed to be from a panicked dinosaur stampede.

A blend of sporting history mixed with childhood nostalgia await visitors to this museum.

On the edge of grassland in northeastern Colorado, these rock formations are some of the few remnants of a high plain that has eroded away over millions of years.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The ruins of a 12th-century seaside castle on the southwest coast of Scotland.

This monument claims to display the first pot used to cook a famed Southern stew.

This lush 12-acre site was once named the finest Japanese garden in North America.

At 22 feet tall, these Bronze Age monoliths are some of the tallest standing stones in the United Kingdom.

The first plantation museum in the United States to focus on the lives of enslaved people.

This tiny site in Iowa, part of a patchwork national wildlife refuge, is home to ancient flora and fauna.

An unusual geological feature towers over the remains of a dark episode in United States history.