An abandoned quarrying village turned commune is now a hub for learning the Welsh language.

Ospreys visit this location every year to nest.

London's amazing modernist public square that never was.

A rare wooden coffin set vertically into the Gothic arch of an ruined church.

The wreck of a B-29 Superfortress now stands as a memorial left in the moors.

This ornate English estates "Prodigy House" still bears the cannonball marks of civil war.

A small alleyway with an unusual moniker.

Beautiful tiles decorate many of the town's surfaces and stand testimony to its glorious artistic history.

More than 70 detailed dioramas—including some rather nontraditional ones—fill this charming museum.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

A magnificent, long-abandoned castle built in the wake of the reconquest of Spain.

An eclectic collection of thousands of items owned by the sculptor Frederic Marès.

This home of a taxidermy hoarder is among the grandest and most singular of historic English estates.

Inside this reclamation yard is a unique collection of horse-drawn vehicles.

The world's smallest commercial theater is set up in what was once a urinal for Victorian men.

In pastoral England, a plaque marks where an imaginary community addressed the problem of combat mortality.

A Roman spa buried deep beneath the City of London.

An unusual round church in London with a Templar past.

An urban megalith steeped in local lore.

A missing Roman legion was recreated in sculpture along a Scottish cycling route.

One of Scotland's most important modern structures, it just made the '100 Most Endangered Sites' list.

The discovery of this Neolithic settlement, which contained a Stone Age "cathedral," threw archaeologists for a loop.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

An 18th century monument regularly tagged with unsettling graffiti referencing a 1940s unsolved murder.