Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

A countryside Romanian cemetery filled with colorful crosses bearing lyrical, ironic, or satirical rhymes.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

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

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

This massive underground salt mine now holds a sci-fi theme park in its depths.

Moss and stone turn this waterfall into an otherworldly liquid veil.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

A sinuous path among steep cliffs creates a stunning sight in southwestern Serbia.

This memorial park stands on the site of one of the largest mass executions of the Second World War.

A Serbian church lit by chandeliers made of weapons.

This spaceship-like Serbian monument reaches for the stars in celebration of the fallen fighters of fascism.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

Structure built from the skulls of vanquished foes.

Legends of treasure and spirits flow from this this fairy tale-like oasis.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

Also known as the Blue Church, the building was consecrated to the daughter of Andrew II.

A gorgeous stone viaduct crosses over a bucolic valley.

This region of Slovakia boasts some of the most plentiful opal mines in the world.

The ruins of a 13th-century monastery that long served as a place of refuge from wars and raids.

An extraordinary museum devoted to the pop art legend created by Slovak artists.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

The world's newest astronomical clock is also its most accurate.