The rust covering this old mine's abandoned buildings matches the red pigment it once produced.

A spectacular disused railway viaduct in a beautiful countryside nature reserve.

Reputedly based on the tomb of Jesus Christ, this crypt is the oldest surviving structure of any cathedral in England.

At 22 feet tall, these Bronze Age monoliths are some of the tallest standing stones in the United Kingdom.

This Gothic Revival castle used as a shooting location for "The Secret Garden" and other films.

Legend has it the famous Robin Hood would attend mass at this 12th-century Cistercian abbey in Sherwood Forrest.

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

Isaac Newton's former home, where the famous apple tree still stands.

This 20-foot mountain is made up of some 15,000 mannequins—if you visit, you can even take a piece home with you.

This 600-year-old tower was built as a comfy residence for cherished pigeons.

This abandoned gun tower was built to defend the River Thames from a French naval attack.

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

A little-known ruin with a convoluted history and a fascinating latrine drainage system.

This ancient Bedfordshire church was abandoned when the village's population slowly began migrating to new towns.

This beautifully situated lakeside Roman settlement was likely built during the reign of the Emperor Hadrian.

The ruins of a 17th-century lodge on a grand estate are being slowly restored to their former glory.