A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

A striking depiction of Teotihuacan's mysterious "Spider Woman."

The striking jade death mask of an ancient Maya king is displayed in a replica tomb in Mexico City.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

The television series' iconic giant foot was borrowed from this classical painting.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

This museum inside a museum tells the story of London's timepieces.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

This strange sculpture of a menacing skull surrounded by sun rays was discovered at the foot of the Pyramid of the Sun.

360° views of the city plus five floors of optical illusions and hands-on science.

A sweet symbol marks the place where torturous executions were once carried out.

This Swedish astronomical clock was in storage for almost a century before its glorious workings were put on display once more.

Eighteenth-century home, where Herschel discovered the planet Uranus.

A giant pineapple, a symbol of hospitality, and an amazing vacation rental option.

A striking symbol of the Bulgarian capital.

"Holy Wisdom" overlooks the city that became its namesake.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

The heads of two giant mythological water horses honor Scotland's horselord past.

The ruins of an 11th-century Norman castle with a rare, perfectly circular shape.

The largest greenhouse in the world is home to over one million types of plants.

Deliberately hidden for centuries, the magnificent Saadian Tombs were eventually uncovered in 1917.

This vast masterpiece of Moroccan architecture spreads across 20 acres.