An artist's mausoleum with a haunting echo.

A stunning Victorian abbey and walled garden on a lakefront.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

2300-year-old Roman road connecting the empire.

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

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

Famously misunderstood wonder of the ancient world

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

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

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Breathtaking and huge 430 year old maps of Italy.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

Go surfing on this urban wave, "hacked" by local surfers.

Look closely and you’ll notice that the color changes a third of the way up the tower.

The "lovely red Vega" of the legendary record-settling pilot.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.