The first archaeological site discovered by aerial photography.

A giant white horse drawn on an English hillside may not have been intended to be a horse at all.

The granddaddy of English geoglyphs dates back to the late Bronze Age.

An ornate aviary built during the Victorian trend of collecting exotic birds.

A tribute to all the green-thumbed workers who tend London’s public parks and gardens.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

An incarceration museum on the spot of possibly the oldest prison in England.

This one has sailed five times as far as Sir Francis Drake's famous ship.

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

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

The Art Deco artwork depicts gilded carriers of deadly illnesses.

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

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

You can climb to the top of the column built to honor the "father of British inland navigation."

This magical museum celebrates the life and work of a seminal children's book writer (and occasional spy).

Now overgrown, these anti-tank barriers from World War II are sometimes called "dragon's teeth."

This 18th-century folly is one of Europe's rare "garden mosques."