Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

A large replica of a monumental Roman inscription is located on the side of this museum.

This large, circular tomb is the final resting place of the first emperor of Rome.

This basilica is dedicated to two saints, one of which is known more for his famous quote.

The Emperor Tiberius' palace of debauchery.

A crumbling watchtower and a lighthouse overlooks the site believed to be the Sirens' cliff in the "Odyssey."

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

Some say this medieval church is where the poet Dante married his wife and also met the love of his life.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

Well-preserved, still-functional sliding wood doors from Ancient Rome can be found in this Vesuvius-stricken house.

Pompeii's less famous neighbor is still revealing her secrets.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

Tulsa's historic skyscrapers define the oil boom era of Art Deco construction, and are known for their ornate arched lobbies.

The homestead of American patriot John Adams.

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

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

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

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

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

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.