An eccentric 18th century naval officer built a ship's quarterdeck on his roof, the inspiration for Mary Poppins's "Admiral Boom."

Installed at a chaotic intersection, this gave London traffic cops a place to hang their heavy woolen coats.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

Repository for more than 22 million pickled specimens.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

Remnants of a 4th-century church with vivid medieval frescoes and ancient sarcophagi hide beneath this old basilica.

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

The ruins of an abbey believed to have been founded by Charlemagne in the 9th century.

This historic recreationist school churns out warriors that may very well have had a fighting chance in Rome's pits of the day.

A magnificent waterfall is also home to the remains of a Roman hydraulic engineering system.

The studio built by fascists in the hopes of "reviving the film industry" with the occasional propaganda film opportunity thrown in.

One of seven Jewish catacombs in Rome and one of only two open to the public.

Jesus' footprints and the first catacombs in the world.