This gnarled old tree supposedly sprouted from seeds kept in the pocket of a 16th-century Spanish sailor.

A museum marks and documents the site of the Titanic's launch.

These engineering masterpieces are a dominant feature of the Belfast skyline.

The ship built to ferry passengers and goods to the doomed Titanic is now the last remaining White Star Line vessel.

These barriers stand as stark reminders of Northern Ireland's troubled past.

This massive monument has been telling the time for 150 years—at a slight angle.

It was once nicknamed "the most bombed hotel in Europe."

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

A set of 27 bamboo tubes creates an eerie soundscape that changes with the wind.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

This abandoned five-star hotel is now a five-star urban exploration destination.

A perfectly circular lake is formed by the crater of an ancient underwater volcano.

Europe's oldest still-operational tea farm also boasts a spectacular view.

This fairy-tale, neo-Gothic church in the Azores is a world of magical realism.

This ancient Egyptian obelisk still bears the wounds of World War I.

The sumptuous ceiling was one of the last things Charles I saw before his execution.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

A living memorial to the trees London lost during the Great Storm of 1987.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

The medieval woodcut-style artwork chronicles life in medieval London.

Bloodstains can still be seen in this medieval church where two medics saved lives on D-Day.

The Lone Star plaque hangs in a bombed-out bunker in Normandy to honor a Texan colonel's heroic actions on D-Day.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.