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

An ancient relic in Edinburgh that is around 4,000 years old.

In memory of the assassinated, now-canonized Salvadoran archbishop who is the namesake of nearby Romero Place.

A treasure trove of astronomical, mathematical, and scientific instruments at Cambridge University.

An extraordinary library and archive dedicated to the history of the Arctic and Antarctic poles.

This Victorian footbridge over the River Tees was originally built to carry water from the high moorland to the industrial towns on the coast.

This building was once a town hall, a fire station, a prison, a dairy market, and the target for two marksmen.

A perfectly running 230-year-old silver automaton and music box.

Originally built in the 15th century, this well gave the surrounding area its name.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

A much-loved local landmark pays tribute to the shipbuilding past of this area.

A giant scrawl on the skyline of south London.

More than a million titles fill the labyrinthine shelves of this prestigious private library.

The canine-themed book collection claims to be Europe's largest dog library.

This studio was home to David Bowie's first single, even if it did turn away the Beatles.

An unusual artwork dedicated to a unique man that entertained people visiting Cambridge while raising money for charity.

A jumble of concrete on the corner of one of London’s terraced buildings is actually a work of art.

This mysterious pyramid is said to be part of a complex web of occult and Freemason symbols.

This sculpture used famed boxer Joe Louis as the inspiration behind its body.

One of the city's oldest pubs displays a skull said to belong to the country's last witch burned at the stake.

Visit the grave of a famous feminist author and the mother of Mary Shelley.

A mysterious suspended hand greets unsuspecting visitors at the Tower of London.

A small collection of objects of a bygone era hide in plain view.

This public bathroom is guarded by a flyswatter-wielding army major.