Once one of the largest rooms full of books in the world, this bookstore basement is still a treat for bibliophiles.

The "father of immunology" used this humble hut to offer the local people some of the world's first free vaccinations.

This coffee shop lies hidden beneath a historic church.

A small poultry graveyard in the courtyard of a popular Key West watering hole.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

The final resting place of New England's last "vampire."

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

This abandoned caretaker's apartment is one of 13 left in the New York Public Library system.

These rustic holiday homes are made from discarded fishing boat hulls.

Created by a pair of artists, this former hotel was designed to provide a minimum of everything including comfort.

This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

Of five volcanoes located in the massive Tengger caldera, this cone is the youngest and most active.

The longest hedge maze in the world.

Detailed sandstone carvings show an array of symbolism and adorable animals.

Beasts and branches swirl in sandstone carvings, interrupted by one strange creature.

This strategically placed hill fort has served defensive forces from the Iron Age up until the 20th century.

This ancient fort overlooks the site of a disastrous retreat from the English Civil War.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

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

An Iron Age hillfort rooted in Arthurian legend was made famous by musician Peter Gabriel.

This crumbling headstone commemorates the first death by tiger in Britain's history.

The last known resting place of the king who united England.

Colin Stokes "got a bit carried away" and built a castle that looks like something out of Tolkien.

This stretch of the River Severn where large waves flow against the current is the birthplace of river surfing.