Singapore's landscaping project is home to 18 incredible Supertrees.

Home of the ruins of a British slave castle.

The oldest of its kind in the country, this tree sits where formerly enslaved people are said to have founded the city of Freetown.

A rehabilitation center for confiscated, orphaned, and abandoned chimpanzees.

A newspaper editor turned this abandoned island into a tortoise nature preserve that's now the world's smallest national park.

Over two-thirds of the world's population of giant tortoises live among this coral formation.

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

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

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

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

Dakar is home to one of the oldest African art institutions in West Africa.

This tiny, tranquil Senegalese island serves as a powerful symbol of the Atlantic slave trade.

Despite a fraught and controversial history this African island holds a powerful monument to the tragedy of the slave trade.

This giant volcanic crater holds its very own field of salt.

These towering cliffs jut dramatically from the middle of a barren desert.

Within the Saudi Arabian desert lies a 2,000-year-old ghost town made of stone and mud.

More than 100 monumental tombs carved into rock are preserved at this ancient Nabataean site in the Arabian Desert.

Looking like nothing more than a cartoon deserted island, this tiny sandbar is home only to a single umbrella.

Réunion Island's highest point is a 2 million-year-old volcano and a paraglider's paradise.

At the center of an island in the middle of the Indian Ocean is a deep chasm ringed by tall waterfalls.

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

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.

This picturesque round lake is said to be home to the legendary Mokèlé-mbèmbé.