This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

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

An island on the Venetian Lagoon hosts this stone chair that has nothing to do with the King of the Huns.

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

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

Venice's island of the dead.

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

Centuries ago, red and white wine poured from the statue's breasts whenever a new Venetian ruler was elected.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

The oldest botanical garden in the world that technically isn't the oldest.

One of the largest squares in Europe contains an entire artificial island.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

The roof of this ancient mausoleum is made from a single Istrian stone weighing a massive 230 tons.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

This foreboding medieval castle was twice besieged by barons rebelling against the English king.

Art Deco and “Wrenaissance” mash-up, this recently restored royal residence has been home to kings and comes with secret monkey passages included.

Putting the "mod" in "modular" since 2000.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

A student driver's nightmare.

A museum that chronicles the interesting and often dark history of the London docklands, once one of the major trading ports of the world.

Ship-sized kinetic sculptural fantasy.