Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

Legend says this sacred tree was a gift from goddess Athena.

The highest tides in the world come in and out here twice a day, allowing you to essentially walk along the ocean floor.

This rocky spread has been squeezed up directly from the bowels of the earth.

Hundreds of enormous icebergs drift through this waterway every year.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

Science meets wall art to highlight the beauty of famous mathematical equations.

A tiny house showcases the busy life of a local gnome.

The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

This century-old street sign is a forgotten remnant of the old city.

This public toilet built in the famous Amsterdam School architectural style is a Dutch national monument.

This early 19th-century graveyard is the final resting place of Vincent van Gogh's mother.

Unknown to many, this is where items not displayed in a Dutch history of science museum are held.

A massive explosion that leveled hundreds of buildings in the city of Leiden is remembered by a waterside plaque.

The remnants of a WWI naval mine that once terrorized the country now decorates a street.

Once housed in the towers of this Gothic church, this 17th century clock still ticks today.

A 14th-century church holds a unique monument to a German mathematician who dedicated his life to calculating the value of pi.

One of the great math minds of the 17th century is underfoot in this 900 year old Dutch church.

An unassuming rod in the Netherlands was once the old standard unit of length for the entire Dutch empire.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.

A trio of red, white, and blue stones embedded in the streets of Leiden are markers of medieval territory and law.

Only a few walls remain of the last church the Pilgrims used before they sailed to North America.

One of the Leiden's oldest pubs is also the birthplace of the Heineken star.

A former plague hospital turned medical museum.