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

A repurposed railway tunnel with otherworldly acoustic characteristics.

This medieval manor house was equipped with secret compartments for hiding priests.

The ruins of a once-grand mansion in Northern Ireland are now thought to be haunted.

The bombed out remains of the old church were kept intact next to the new one, as a reminder of the futility of war.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

This chain of artificial lakes was an ideal test ground for the aircraft that would carry the "bouncing bombs" used by the WWII "Dambusters" squad.

The wreckage of an old coastal trading vessel is only visible at low tide.

A steep and winding road in the Yorkshire Dales passes by these deep natural potholes.

This gorgeous space is England's largest independent library outside of London.

This ruin in a suburban park may be the place where Shakespeare's "A Midsummer Night's Dream" was first performed.

This lovely ancestral home inspired the author D.H. Lawrence, and features a tunnel made out of a living willow.

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

This castle resides in a valley known for immense bloodshed during the Middle Ages.

This Gothic castle-like portal is a testament to the amazing craftsmanship of the navvies who built the railway tunnel.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

The ruins of a church destroyed by both the Great Fire of London and the Blitz, now turned into a peaceful garden.

These ruins have been linked to a sherbet factory that exploded, but the story may be entirely fictional.

This ruined medieval castle was the scene of Lord Robert Dudley’s seductive reception for Queen Elizabeth I.

A leafy, peaceful oasis nestled in the heart of Glasgow's busy south side.

A magnificent Victorian garden that brings the charm and style of old-time aristocracy to the 21st century public.

This former medical factory gives home to cutting edge arts in the shadow of a gas works.

Don't be fooled by this fake medieval facade even if it is almost 300 years old.

This Italian-style temple replica has been threatening to fall off the Irish coast for hundreds of years.