This plaque in one of London's oldest public hospitals commemorates the first meeting of two of Britain's most famous literary heroes: Sherlock Holmes and Dr. Watson.

A remarkable feat of Victorian engineering across the Firth of Forth.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

Edinburgh's oldest statue hides within a parking lot behind the city's iconic cathedral.

London's only public statue of the much-married monarch adorns the gate to St Bartholomew’s Hospital.

The next-door homes of two very different musicians, George Frideric Handel and Jimi Hendrix.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

A quiet memorial to those who died saving others in the heart of the City of London.

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

A tiny replica of the iconic London landmark hides on the side of the steel structure.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

Eighty million natural history specimens call this gargantuan museum home.

This statue pays tribute to the iconic musician in the place where he recorded his final studio album.

A replica of the beloved character's house, modeled after the author's own drawings.

This local emblem is the oldest and largest dragon tree in the Canary Islands.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

The world's tallest statue of a woman wields the world's tallest sword and is at risk of toppling over.