J.R.R Tolkien, C.S. Lewis, and other "Inklings" met at the Oxford pub to discuss the now legendary fantasy stories they were writing.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

Catacombs turned marketplace.

One part local history, 99 parts gruesome haunted house.

A display of torture devices used in the Spanish Inquisition and other scourges of medieval Europe.

In the fictional world of Kcymaerxthaere, celestial wonders marked a portal to a powerful route of travel at this site in Madrid, Spain.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

A lush indoor jungle fills this bustling Madrid transportation hub.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

Turntable anonymously received orphans, alms, and groceries.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

The ruins of an ancient stadium that hosted gripping chariot and horse races.

Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

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

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

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

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

Legend has it that this bronze orb, which sat atop an ancient Egyptian obelisk, once held the ashes of Julius Caesar.

The original place where water met land in the City by the Bay is outlined in brass.

An 18th century fountain and two columns are all that remains of Rome's forgotten river harbor.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

This 11th century tower is said to be the oldest building in Oxford.