This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

A pair of stones embedded in an Edinburgh street memorialize one of the city's last public hangings.

These steps offer a breathtaking view of one of Europe's most besieged fortresses.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

The fountain marks the area where hundreds of accused witches were burned at the stake.

Eat the ultimate iteration of Portugal's most beloved pastry.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A memorial dedicated to the victims of the My Lai Massacre.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

See what remains of a once grand ancient Roman circus.

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

A Milanese café entirely designed by the American director Wes Anderson.

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

The spectacular and eerie moss-covered grave site of 19th-century Belgian merchant.

The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.

This former Masonic lodge has been transformed into part museum, part bar, all awesome.

A short distance from the Eiffel Tower is the final resting place of several of the city’s more well-known and interesting characters.

The narrowest street in Paris.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

This artificial cave looks like something out of a fairytale.

This doorless 20th-century elevator doesn't stop or slow down.

The hidden lair of an alchemist rediscovered in a 2002 flood.

A Jenga-style cylindrical tower of books that appears to go on forever.