The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.

Hidden for 165 years inside a building designed by Thomas Jefferson are the remains of what may be America's first educational chemistry lab.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.

An enigmatic monument to the Irish revolutionary who plotted an uprising against British rule.

The oldest church in Inverness witnessed the brutal executions of many Scottish soldiers.

Model Trains and Much More in Hamburg.

This red light district plaza memorializes the Fab Four and their historic connection to the area.

Hamburgers are intensely proud of their tunnel beneath the river.

The compass on its front was a handy tool for 17th-century merchants who needed to know the direction of the wind.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

The world's largest collection of ship figureheads includes figures from legends and history alike, from Sir Lancelot to Abraham Lincoln.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Once in disrepair, this popular Texas stop along iconic Route 66 has been restored to its past glory.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Mysterious glowing orbs float through the desert night.

The largest public collection of roses in the United States.

The world's tallest statue of an American hero.

Some of the best pastries in "the Czech heritage capital of Texas" come from a gas station off I-35.

Official museum, hall of fame, and repository of the Texas Rangers.

Housed in a century-old building, this museum's dedicated not just to soft drinks, but to the free enterprise system.

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.