One of the oldest masonic temples in the Netherlands, built in 1757.

A lecture hall sink once used by Einstein and other noted physicists is now regarded as a strange science relic.

An ancient Egyptian temple sits within a modern European museum.

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

Devious political maneuvering and four ancient, working telescopes are central to the world's second-oldest observatory.

Tucked away in the Leiden city hall are a group of works by famed artist MC Escher.

Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.

Oldest Museum of the Netherlands is a true cabinet of curiosities.

A former plague hospital turned medical museum.

This sign marks the entrance to a tiny proto-state within the small country of Moldova.

There is a mouldering Jewish cemetery hidden away in the capital of Moldova.

The largest wine cellar in the world is a 150-mile network of underground caves near the capital of Moldova.

A unique collection of Soviet military artifacts lies hidden away in a disused train, in the unrecognized Eastern European republic of Transnistria.

At less than four inches in height, this iconic fictional character is the smallest public statue in all of Moldova.