This sacred, circular cave is lined with pools so clear and still that it's hard to tell where the water begins.

Drink and dine in a coral cave that's at least 120,000 years old.

After sunset the heart of Zanzibar's historic Stone Town neighborhood transforms into a culinary playground.

In Zanzibar, a historic 19th-century palace is a reminder of the world's shortest war.

The largest game reserve in Africa is home to thousands of species but refuses to house humans.

Freddie Mercury's childhood home is now a monument to the iconic Queen rockstar.

The world's largest underwater restaurant is submerged off the southern tip of Norway.

The world's seventh-largest coral reef contains an incredible amount of biodiversity.

Fine dining 20 feet below the surface in the Indian Ocean.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

Bioluminescence in the reefs of the Maldives causes the sea to glow like a starry night sky.

A scenic UNESCO site that doubles as a habitat for various forms of wildlife.

A mysterious tunnel hidden in the shadows of a colorful, historic sanctuary.

An abandoned pasta factory in the centre of Bucharest, once home to Bulgarian revolutionaries and a hub of crime.

A magnificent, glittering building tucked into a tiny Bulgarian mountain town.

The preserved arm of a third-century sorcerer is believed to have the power to lift curses and spells.

This metro station doubles as an unintentional paleontology museum.

The only Leonardo Da Vinci painting in the Western Hemisphere.

The kitsch mansion of the former Romanian president Nicolae Ceaușescu features a golden bathroom.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

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

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

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

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