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

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

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

Old batteries and frog skeletons reside in this lakeside monument to Alessandro Volta.

A glass display case holds the document that ended the Second World War—which one person signed on the wrong line.

The famous aviator's final resting place is a study in natural beauty.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

These ancient sacred grounds granted amnesty to those who managed to reach them.

This legendary urban waterfall creates a dazzling display of rainbows.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

There’s a hidden military meme engraved on the World War II Memorial.

In Parr Park, thousands of painted rocks line this walking trail.

This seaside pine grove features an exclusive watchtower that presents amazing views.

The Latvian city of Ventspils is filled with dozens of cow statues showcasing unique themes.

This former Nazi labor camp is now a poignant memorial, complete with giant Soviet-style monuments.

This controversial monument was designed to lionize the Red Army, but also disheartened the Latvian people.

This charming Latvian lane doubled as Baker Street on the Soviet Union’s version of Sherlock Holmes.

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.

The place where Samuel "Slater the Traitor" brought the Industrial Revolution to America.

An architectural statement of artistic intent smack in the middle of Providence, Rhode Island's Colonial uniformity.