The largest of London's subterranean rivers and once a mad, bad center of London life.

The remains of Crystal Palace Great Exhibition of 1851.

A student driver's nightmare.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

Collection dedicated to brands, packaging and advertising.

An 800-year-old island castle in Guernsey's main harbor.

A statue erected in honor of the toadish nickname given to Jersey residents by the French.

This natural crater along the coast of Jersey may take its name from the devil statues who have watched over it.

Underground hospital complex constructed by slave laborers during the German occupation of the Channel Islands.

An intricately decorated tiny place of worship.

The first island in the world designated a light-pollution-free astronomical observation point.

On the southwestern tip of the Isle of Man, a stone monument to one of the island's great conservationists.

This Victorian water wheel is affectionately nicknamed "Little Isabella."

Believed to be the former location of one of the earliest Viking assemblies in Europe.

A 150-year-old steam locomotive crosses the southern half of the island daily.

A prison tower–like edifice honoring a beloved local benefactor.

This hidden bridge is where local children leave gifts and messages for the island's fay folk.

An unusual monument to a 19th-century circus star.

The remains of the wrecked steam trawler can be found on the beach at low tide.

Mysterious chains and iron stakes adorn this strange grave, with no explanation.

World's largest working waterwheel has been around for over 150 years.

Roman ruins found on the outskirts of a small town on the North Wales coast have over time become a strong part of the community's identity.

Associated with the famous wizard, it is said that when this oak tree falls, so will the town.

The seaside ruins of an ancient salt production facility.