This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

These ruins once made up the capital of Lydia, where metal coinage was allegedly invented.

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

This equestrian statue of Constantine the Great has been the subject of criticism for centuries.

A graveyard that dates back over 200 years stands near a busy shopping center.

An 18th century fountain and two columns are all that remains of Rome's forgotten river harbor.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

This restored eighth-century palace is a shining example of ancient Umayyad architecture.

Amid the rubble of Aleppo's Old Quarter, part of a historic market has been restored and re-opened.

The best-preserved ancient theater in the world.

This ancient Roman arch misled treasure hunters for centuries.

This unassuming passageway played a key role in one of the most important events in U.S. history.

This cannonball stands as a reminder of the final act of a fleeting governor amidst a revolution.

Plaques on its facade commemorate the Tiber's most destructive deluges.

The observation point offers spectacular views of the ruins of an ancient Armenian capital.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

The Pennsylvania shopping center was once the setting for the 1978 film, "Dawn of the Dead."

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

This impressive working clock made of 16,000 plants changes its flowers twice a year.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

The only place for a truly presidential dram.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.