Large Hadron Collider and the Birthplace of World Wide Web.

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

Three bridges straddle a stream, one stacked upon the other.

Outstanding, eerie frescoes and decorations fill this 19th-century monastery.

Said to be the only museum in the world dedicated to the most classic of all blooms, the rose.

This once-grandiose behemoth of a monument from the socialist era now sits quiet and closed up.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

An abandoned saucer-shaped monument in the Bulgarian mountains.

Eastern Bloc nostalgia, anybody?

A collection of art from Bulgaria's time as a communist state.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

Frida Kahlo's childhood home, now a museum of her life and works.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

A marvel of Byzantine engineering under the streets of Istanbul.

A sixth-century Byzantine cistern hidden below a modern carpet store.

Balanced on four stone pillars, this historic tower was the site of a tragic political assassination.

A section of the long chain that blocked enemy ships from entering Constantinople.

This beautiful train graveyard is one of the largest collections of steam locomotives in the Mediterranean and Europe.

Climb a set of vertiginous stone steps to the top of this impressive ancient edifice.

A surprising and unconventional mosque hidden in the subsoil of Istanbul.

This historic hotel preserves many treasures from its heyday hosting passengers on the Orient Express.

This crumbling medieval basilica once attracted pilgrims by the thousands to collect a miraculous dust that formed above the saint's tomb.

The home-turned-museum of Barış Manço, the mustachioed Turkish Elvis for children.