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

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

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.

An ordinary lamppost situated in the middle of Cambridge has an unusual moniker and history.

The Cambridge pub where Francis Crick announced that he and James Watson had discovered the DNA double-helix.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

Named after a lodging site that existed nearby, a bridge has existed at this location since 1455.

A working model of the entire San Francisco Bay and much of the Sacramento River Delta, complete with regular tides that change every 14 minutes.

Baroque celebration of the end of the Great Plague of Vienna.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

It houses the remains of a 17th-century version of the Titanic.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

The medieval woodcut-style artwork chronicles life in medieval London.

A mysterious shape catches the eye in this 16th-century painting.

Sculptor Antony Gormley used chaos theory and fractal growth to design his tallest creation.

The bones of two medieval royal lions were discovered at the historic fortress.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

A measuring mishap led to these artificial stone ladies losing their stomachs.

London's marvelous wildfowl reserve along the Thames.

An architectural oddity hides in plain sight on this iconic London bridge.