This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

Natural history museum displaying a famous taxidermied St. Bernard.

The bears of Bern have been a city highlight for over 500 years.

The Swiss artist's bulbous and overgrown shape-shifting sculpture controversially graces the center of Bern.

This simple apartment may have inspired some of the most important theories in the history of science.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

A sublime medieval path adorns the marble floor of one of the most beautiful Gothic cathedrals in France.

Amid rushing rapids, this small bit of land is an important First Nations site on border between Canada and the United States.

Figures of unknown origin carved into the surfaces of underground caves.

A 2017 crowdfunding campaign saved this historic castle from being destroyed.

A huge Megalithic chamber tomb located behind a cafe.

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

A monument to the thrice mayor of London who according to lore made his fortune by selling his rat-chasing cat.

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

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

Traveling collection of amazing automata.

A tongue-in-cheek arcade where the games are based on everyday life.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

A famous burial ground with a history both grim and literary.

A tribute to all the green-thumbed workers who tend London’s public parks and gardens.

This may be the last of London's wooden pavements, which were once a common sight in the city.

This midcentury LA bar was the birthplace of tiki culture.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

This sculpture, residing in a quiet corner of a London park, honors the victims of 9/11.