The ruins of a 12th-century Cistercian monastery can be found alongside World War II tank traps and pillboxes.

Take in the views of Big Ben with a Guinness in hand at this floating pub aboard a 1930s Dutch barge.

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

Pop culture has helped to keep this iconic British building from being destroyed.

One of London's lost rivers runs through a pipe over the tracks of this subway station.

Eighty million natural history specimens call this gargantuan museum home.

The monster at the center of the Darwin Center Spirit Collection.

An inverted staircase above the entrance to the Bethnal Green Underground Station functions as a memorial for people who lost their lives during the worst civilian disaster in the U.K. during World War II.

This coffee shop lies hidden beneath a historic church.

A museum wholly devoted to juvenescence.

This sprawling, Brutalist estate feels like a city within a city.

Since 1887, this old-school shop has stacked its shelves with extraordinary coffees and teas.

This hidden green space is the city's second largest conservatory.

The anatomical-pathological collection of a man who changed surgery.

The Columbia Road Flower Market is now open every Sunday, rain or shine.

A cluttered and astounding collection of antiquities and curiosities.

Explore nearly 400 years of English middle-class home life.

Drink your espresso at a Victorian-era urinal in this underground-restroom-turned-coffee-bar.

A vintage media store and safe haven for cinema buffs who love 16mm films shown on vintage projectors.

The remains of the great moral philosopher reside in a university in London.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This 1920s Dutch barge is now a floating bookstore.

Black cat statues guard this temple-like Egyptian revival factory.