This large, circular tomb is the final resting place of the first emperor of Rome.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

Once a train station along the Great Eastern Railway this vibrant coffee shop and bar is where members of London’s creative class mingle.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

London's smallest police station is barely the size of a phone booth.

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

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The world's oldest optical museum is an odd collection where the exhibits look at you.

These ornate arches show how the course of the River Thames has changed.

A living memorial to the trees London lost during the Great Storm of 1987.

An unusual ode to the late Irish playwright, complete with a squiggly bust and coffin-shaped bench.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Colorful murals by Jean Cocteau hide within this peaceful London sanctuary.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

The television series' iconic giant foot was borrowed from this classical painting.

Repository for more than 22 million pickled specimens.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

A monolithic monument in Greater London.

This lovely little burbling creek is actually a deadly waterway that has dragged down everyone who ever set foot in it.

Yup, that's a 330-foot yacht passing over the highway.

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

The underground sanctuary of a mysterious ancient Roman religious cult contains an exquisite traditional fresco.

This medieval Italian town is a sheer (and beautiful) cliffside defense.