It was once nicknamed "the most bombed hotel in Europe."

These barriers stand as stark reminders of Northern Ireland's troubled past.

At high tide, the base of the lighthouse covers practically every inch of the island.

World's largest working waterwheel has been around for over 150 years.

The plunge pool is a surviving relic of a rowdy royal residence.

A six-ton wedding present for the King of the Scots.

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.