An ancient impact crater on the outskirts of Pretoria.

A South African bar inside a hollowed out 6,000-year-old Baobab.

Hidden in the hills is a mysterious stone structure, known only to a few.

A curious urban windmill once owned by a renowned British mathematical physicist.

These giant sculptures are supported by a bizarre menagerie of feet.

This oak sculpture at the edge of a small woodland is nine feet tall and shrouded in mystery.

This whimsical stacked cabin looks like something out of a children's book.

This multicolored meandering masterpiece is Britain's longest bench.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

This ruined folly was originally built to honor a failed American state that would have become "Westsylvania."

The remnants of a strange stilted building on rails can still be seen at low tide.

To literally keep their waste out of their own backyards, the citizens of this English city built an impressive sewer system that is still in use today.

One fisherman has used his love of pebbles and shore to create a crazy garden of rocky art.

Decrepit Victorian public lift is a white-knuckle ride.

Regency-era excess on the English Coast.

Henry VIII's forgotten castle was built by the gunpowder-obsessed king to be defended solely by cannons.

This preserved puppy was an adorable beacon of charity.

This monumental gateway marks the northern edge of Brighton and is a welcome sign to all visitors to the seaside city.

This memorial to the thousands of Indian dead during WWI was callously used for target practice during WWII.

Now isolated, this church was once the center of a bustling village that succumbed to the Black Death.

A stone plaque and a winking pub name are all that remain to remember the victims of deadly 1836 avalanche.

An ancient water supply dating back almost 500 years can still be found standing in East Sussex.

A neutrino detector built into the largest man-made underground cavity in the world.