This irregularly shaped sea fortress has defended not one but three different sovereign states.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

A small Richmond island dotted with the remnants of hundreds of years of history.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

A sprawling collection of books and manuscripts about ancient Greece that would have put their famed libraries to shame.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

A stunning bridge that appears as if it's lunging to the shore, and has a legend of a devilish architect.

Explore the quarry where the marble was sourced for Michaelangelo's David.

Five candy-colored villages on the Italian Riviera.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

Monasteries on rock pillars, once accessible only by frayed ropes.

Beautiful views and Roman-style statues on the Italian coast.

A beautifully well-preserved ancient Roman villa.

The Bourbon royal family had this unique octagonal hunting "cottage" built on a tiny islet in Lake Fusaro.

The glowing blue Nymphaeum of Emperor Tiberius.

A town saturated in Italian rationalist architecture was once marshland drained by Mussolini.

This medieval Italian town is a sheer (and beautiful) cliffside defense.

Cave shrine on Monte Pellegrino.

142 ceramic steps become a mosaic once a year.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

A modern sliver of architecture in Roma.

Things seem to roll, flow and run uphill on this short patch of road near Ariccia, Italy.