This unusual geoglyph was built as a warning so low-flying aircraft wouldn't scare the zoo animals.

This rare aquatic phenomenon is one of the more accessible tidal bores in Morecambe Bay.

Also known as Rye Castle, this 13th-century fortification later became a prison and held one of Rye's most famous criminals.

This police call box harkens back to an era of pre-radio communications, and has a rather unique feature.

Journey through this open museum where even employees remain true to period.

At the height of alum production at this factory, human urine was a valued commodity.

Home to one of the tallest church spires in Europe, this historic church once played host to King Henry VIII and Anne Boleyn.

This star-shaped artillery fort protected the mouth of the Thames from the 16th century to the Second World War.

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

No one is sure what to do with this WWII shipwreck that sits at the bottom of the Thames, still loaded with tons of explosives.

This charming, narrow-gauge railway in the Thames Estuary is sometimes referred to as the "Train to Nowhere."

A quirky "castle" formerly belonging to a famous British inventor.

These abandoned coal mine towers near Sherwood Forest might soon boast the U.K.’s longest zip-line.

The world's first purpose-built motor racetrack was destroyed by the outbreak of two world wars.

This tower was constructed to commemorate the man who helped bring true democracy to the United Kingdom.

An ancient hotspot for spotting schools of fish.

Derelict chemical plant on the North Sea is a beautiful industrial ruin.

This Georgian Gothic building was created to shelter and feed deer.

This lighthouse was crafted as penitence for the theft of wine bound for a monastery.

For over 500 years this timbered alms house has provided a home for elderly residents of Coventry.

This early Norman castle was the first historical monument protected by an act of Parliament.

A 17th-century church is nestled within the walls of a 15th-century ruin.

One of the few surviving examples of Victorian-era public toilets now houses a small homestay.

A strange and ancient landscape hides the dark, cavernous remains of a 5,000-year-old flint mine.