The initials "GW" mark where one of Scotland's most important Protestant martyrs was burned at the stake.

This 19th-century prison once held Irish revolutionary Constance Markievicz, writer Frank O’Connor, and a nine-year-old pickpocket.

This Georgian mansion blends historical significance with an impressive art collection within picturesque surroundings.

The bones of two medieval royal lions were discovered at the historic fortress.

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

The broken skateboards that became a poignant memorial to a murdered skater.

Abstract dinosaur models in London.

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

The curios of pharmacist and collector Henry Wellcome.

An abandoned shipping control tower looks like a satellite perched at the end of a pier.

These engineering masterpieces are a dominant feature of the Belfast skyline.

This picturesque lighthouse at the edge of the Irish Sea looks like a giant stone pencil.

A museum marks and documents the site of the Titanic's launch.

The raised stones in the middle of this road through Culross are relics of a 17th-century class divide.

A bronze statue of a low three-legged seat commemorates a piece of furniture that started a riot.

Dedicated to the Father of the British Fire Service.

Inside a Scottish castle hangs the tattered remains of a flag with murky origins and supposed magic powers.

The castle that provided the setting for much of 'Monty Python and the Holy Grail' is now a pilgrimage site for fans.

The burial site of a murdered bishop and his alleged killers.

This Scottish bay still reveals evidence of its days as a seaside swimming pool.

The oldest church in Inverness witnessed the brutal executions of many Scottish soldiers.

Hidden in this modern shopping center is a relic of 16th-century capital punishment.

After 800 years, Europe's oldest elm tree has met its end.

This painting of a beloved dog will be on display at the Scottish National Gallery at long as the museum exists.