This medieval manor house was equipped with secret compartments for hiding priests.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

A castle in the Scottish Highlands has been continuously inhabited since the 1300s.

The longest stone bridge in England has an impressive history that dates back over 700 years.

The only museum in the world dedicated to preserving the life and work of American comedian and entertainer, Phil Silvers.

Follow the original medieval paths that wind through this intriguing section of the city.

This memorial to World War II's fallen airmen shows us the movements of the stars that once guided them.

These quintessentially English stepping stones were built for Victorian tourists.

Eighteenth-century home, where Herschel discovered the planet Uranus.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

A mysterious shape catches the eye in this 16th-century painting.

The commemorative stone column conceals a secret laboratory.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

Stare out over the lagoon and beyond from this 10th-century campanile on the island where the city of Venice began.

Two stone columns flank the grand Venice square, but there were supposed to be three.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

Go inside to really appreciate this 500-year-old technological masterpiece.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Thanks to both terrific preservation and historic vandalism this ancient site is known as the "Heart of Neolithic Orkney."

The sign marks one of the endpoints to mainland Britain's longest overland travel route.

This early 19th-century blast furnace only survived because it was a financial and technical failure.

The bombed out remains of the old church were kept intact next to the new one, as a reminder of the futility of war.