An urban laboratory.

A Roman spa buried deep beneath the City of London.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

There's an exclusive Beefeaters pub hidden in the Tower of London.

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

Where condemned pirates met their grisly end at the gallows on the River Thames.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

These morbid carvings remind churchgoers of the inevitability of death.

The plunge pool is a surviving relic of a rowdy royal residence.

The sculpture of the deceased cockatoo flops atop its personal plinth.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

This informal museum is a magical trove of anonymous art collected from car boots and flea markets.

A student driver's nightmare.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

Putting the "mod" in "modular" since 2000.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

Victorian-era Londoners really wanted to believe this 17th-century cistern was actually an ancient artifact.

Tombstones and enigmatic inscriptions hide within a vault beneath a popular London arts venue.

Its collection includes a broad array of social, geographic, graphic design, and political history.

This ancient Egyptian obelisk still bears the wounds of World War I.

This coffee shop lies hidden beneath a historic church.

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

The broken skateboards that became a poignant memorial to a murdered skater.