The elliptical citadel resisted the advance of the mighty Ottomans several times, thanks to the military prowess of the "Dragon of Albania."

England's oldest surviving hedge maze has been confusing visitors for over 300 years.

The geoglyph once sported a glass bottle eye.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

Hauled from the water's depths, Henry VIII's flagship is preserved in this capsule-shaped museum.

One of England's most famous churches hides a pair of little known architectural treasures.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

Grotto replete with mystical designs laid out in glued shell mosaics.

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

This mountaintop lake bubbles and steams in a perpetual boil, thanks to its direct link to the Earth's interior.

The cell which saved the life of Ludger Sylbaris, "the man who lived through Doomsday."

A gallery of underwater art that can be visited by man and fish alike.

Rare signs of the former Soviet Union in the Caribbean, though not where you'd expect them.

This peculiar lake of pitch is so thick and viscous that one can walk on its surface.

A three-centuries-old crypt in the foothills of an old plantation.

This giant Cold War satellite dish has become a symbol of Trinidad's need for sovereignty.

An elaborate shrine dedicated to the four corners of the world unfortunately misses its mark.

Home of the "true" equator.

A turquoise lake within a volcanic crater.