A medieval church with largest and oldest collection of Renaissance frescoes in France.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Get a close-up look at a 16th-century Basque whaling ship at this factory and museum.

The eclectic observatory castle of a 19th-century astronomer and explorer.

A musical instrument played by the sea.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

Twice a day one of these tragic bronze mariners drowns with the tide to remember all those the sea has taken.

Nelson Mandela lived here with his family from 1946 until his arrest in 1962.

Two giant painted cooling towers make for one of the world’s most epic bungee jumps.

The “Thumb” of Mauritius provides a 360 degree view of the entire country.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Northern Ireland's Brobdingnagian stepping stones.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Tourists to the mountaintop Sicilian town often overlook its ancient fortifications.

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.

For part of the year, this innovative greenhouse is painted white to keep the plants from getting scorched.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

This statue celebrating everyday life in Dublin has a few unsavory nicknames.

The modern birthplace of Irish freedom.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

A medieval wash house where people washed clothes in a river allegedly formed by the tears of a mourning nymph.