This plaque marks the former home of one of the first women physicians in the Netherlands.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

The world's oldest Jewish library was founded by Sephardic Jews in 17th century Amsterdam.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.

This massive mural by famed pop-artist Keith Haring was hidden for almost 30 years until its 2018 rediscovery.

Unusual house, in an unusual neighborhood, home to some very unusual peanuts.

A collection of 100 brains preserved in jars on the UT campus.

Originally a leper colony, the island is now an Armenian monastery that's home to an incredible manuscript library and eclectic museum.

Made of giant chains and hung with shackles, this iron cross honors those unknowns who perished under American slavery.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

The "Jade Museum" is full of thousands of intricately carved works of art made from various precious stones.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

A curiosity-seeker's paradise set inside a three-story historic school house.

This Seattle museum displays the history of the telephone through an impressive collection of telecom equipment.

A rotting tree in the middle of Seattle doubles as an elaborately-controlled art piece.

This semi-secret garden in south Seattle emulates a traditional Japanese garden using the plants of the Pacific Northwest.

This museum offers an actual time machine back through Colorado's past.

Where scientists keep miles of very valuable ice from Antarctica and Greenland from melting.

A beach made of semi-precious green sand on the Big Island of Hawai'i.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

A legendary boxing venue and ring featured in Rocky V.

Hidden behind West Philadelphia rowhomes is a haven for migratory and local bird species both ordinary and rare.