The abandoned funicular tunnel was a secret base for the BBC during World War II.

The Bristol Camera Obscura housed in an ancient windmill.

This abandoned mausoleum from 1815 sits deep within the forest surrounding Callendar House.

A lush indoor jungle fills this bustling Madrid transportation hub.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

This pub built its reputation pouring post-shift pints for employees of the cemetery with which it shares a wall.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

A once extravagant mansion, now reduced to ruin.

A painted tribute to an ancient Egyptian king lurks along a stretch of Scottish shore.

A war memorial dedicated to the Free French Naval forces of World War II.

The ruins of a small church belonging to a powerful Scottish family still hold the remains of its patriarch.

The United Kingdom's smallest working cathedral also serves as a quaint bed and breakfast.

Now in ruins, this abbey was the home of Tironensian monks for more than 400 years.

A familiar otherworldly creature guards this 12th-century Scottish abbey.

The only example of a Paris Métro sign in use at a subway station outside of the French capital. 

One of the tallest buildings in Africa provides a great view of Johannesburg's unique geography.

This amateur-built East African church with mismatched towers is an architectural abnormality.

This abandoned bridge over the River Irvine may be the oldest surviving railway viaduct in the world.

Artifacts showcasing the witchy history of Zambia.

Based on a real event, the statue is dedicated to those who fought and died for Zambia's independence.

The skull of an ancient hominid was discovered at this spot.

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

One of Canada's tiniest museums tackles the world's largest turtle.

This historic cemetery stopped accepting bodies before many Canadian cities were founded.