A limestone grotto where daylight filters in from below and turns the water a beautiful turquoise. Also home to a small underwater nativity scene.

Amalfi's pre-industrial history is slowly being engulfed by the lush vegetation of the Ferriere Valley.

Also known as the Temple of Poseidon, this is one of the best-preserved Greek temples in the world.

A baffling beast so absurd a town councilman called it "intellectual vomit in technicolor."

Scotland's oldest medieval bridge is also among the last reminders of early medieval Aberdeen.

Unusually, this ancient Iron Age broch has never been excavated.

Where the sleeping monsters of Scotland's oil industry are left to rust.

The world's shortest street was created by an awkwardly placed hotel.

These ruins are a hidden gem, complete with fantastic views over the cliff edge.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

The ritual has been performed uninterrupted for nearly 700 years.

These marks in Myddelton Passage aren't your run-of-the-mill vandalism, and they weren't made by your typical vandal.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Residential building on the Regents Canal is a breeding ground for creativity and innovation.

On a site with a long military history, a 1980s shelter.

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

This windmill is believed to be the oldest in the British Isles.

Once the largest unsupported dome in the world, beating out the Pantheon and St Peters in Rome.

A historic Georgian building and warm springs.

A face-like natural rock formation so well known, a pub was named in its honor.

A menagerie of curiously bred creatures.

One of the town's most famous residents, holding one of his most famous creations.