The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

These lush botanical gardens employ the most purrfect pest control force.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

This stately 19th century library pushed architectural boundaries at a time when the public library movement was just taking off.

A toxic ghost town sitting atop a massive coal fire.

In which a local geological marvel becomes a quaint roadside attraction.

An outlandish shoe shaped house built by an eccentric millionaire.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

A local prank turned town icon.

The oldest farmer's market in America is so ancient it was approved by the King of England.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

It's a mystery as to why this inland village chose the dolphin as its symbol.

Local lore says passing infants through its holes could magically cure them of measles and rickets.

With lush plants and flowers, huge trees, ponds, and hidden monuments, this place feels a bit like discovering Narnia.

In the ruins of Glastonbury Abbey lies the alleged resting place of the legendary king.

On this wooded path, a stained-glass window creates a spellbinding forest cathedral.

England's steepest street has such a drastic incline that locals tie their parked cars to lampposts when it gets icy.

A Neolithic burial tomb connected with a colorful array of legends.

The only medieval bridge in Britain with its defensive tower still in tact.

This Roman amphitheater is said to be King Arthur's legendary Round Table.

The castle still holds traces of the abandoned Roman fort it was built atop.

Recently restored menagerie of Victorian-era beasts.

The enormous earthwork sculpture honors the ponies that lived and worked in the old colliery.