Rebuilt remains of a temple to Roman god Mithras.

The last working windmill in the U.K. that has eight sails.

Legend says this demonic carving inside a medieval cathedral was one of Satan's minions.

Modern commuters still pass through this 2,000-year-old Roman archway.

Inside this chapel, Victorian jailers took the separate system to new levels.

The oldest of the three remaining bridges in England with buildings on top of them.

The world's first military tank was designed in this English city amid the stalemate of WWI trench warfare.

This English medieval castle is where King John died of dysentery.

One of the earliest large-scale "hyper" roofs in the U.K. is now a derelict roadside attraction.

A quartet of rusting satellite goliaths are all that remain of a communication network that protected Britain from German and Russian air strikes.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

An abandoned 18th century manse looks like something out of an Indiana Jones movie.

A mysterious bridge over a sunken Roman road.

The first German gnome who popularized the garden decoration.