The bones of prehistoric animals and early signs of human habitation have been found inside Malta's "cave of darkness."

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

A monument at the site of a decisive battle in the First English Civil War.

At this historic pub, you can sit back, sip, and watch a whole century go by.

A unique sculpture park that features the works of several famed artists.

A haunting painting meant to capture the calamity of World War I.

This macabre painting of a Shakespearean scene looks like something out of a nightmare.

This mysterious and unique painting is filled with symbolism.

A statue of the original Pearly King is hidden in a church's crypt.

This coffee shop lies hidden beneath a historic church.

An agreement meant to honor the Duke of Buckingham led to this unusually-named passageway near Charing Cross.

A living memorial to the trees London lost during the Great Storm of 1987.

The pretty iron lamp is a reminder of the architecture underneath London's streets.

The famous polar explorer stands outside the Royal Geographical Society's headquarters.

This ancient spring in central London was featured in a Peter Pan story.

Two tombstones associated with the much-beloved children's story.

Black cat statues guard this temple-like Egyptian revival factory.

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

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

The remains of a convent turned military barrack in the heart of Madrid.

Just like in Hollywood, Madrid has also a forgotten walk of fame.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.