Designed by the architect who also had a hand in crafting the Westminster Abbey and Bristol Cathedral.

Over time, this castle grew to encompass the entire island.

The largest underground lake in Europe.

Two beautiful Victorian-era parks replete with ornamental waterfalls and lakes.

It's believed a local adventurer spent 50 years living inside this cave.

This trail follows unique stone railroad tracks and a historic waterway to the south coast of Devon.

An abandoned monastery sits on a far-off island in the Adriatic Sea.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

Magnificent frescoes decorate the interior of this Romanesque church, which also showcases an unusual phenomenon during winter solstice.

A medieval house with mysterious alchemical inscriptions on its facade

At the height of alum production at this factory, human urine was a valued commodity.

In the middle of a barren moorland, the remnants of a lost British Space Age stand like a 20th-century Stonehenge.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

The ridged layers that make up this river canyon represent Earth's geological history.

Inside this former medieval prison is a collection of objects designed to inflict unbelievable pain and suffering on the human body and mind.

This incredible viaduct was part of the Victorian railway boom and helped the Midland Railway navigate tough terrain.

Some of New York's best tacos can be found in the back of an unassuming bodega in Queens.

This giant wooden treehouse within a sprawling garden has its own eatery.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

One of the oldest seagoing boats in the world can be found at the Dover Museum.

This family-owned bakery is one of the last places in Brooklyn to sell the Nation of Islam–inspired bean pie.

Blue-green pools and smooth stones comprise one of Spain’s most idyllic hidden wonders.

This fresco-covered medieval monastery hangs from the side of a steep cliff.