Hundreds of caves filled with thousands of centuries-old statues and murals.

A lush desert oasis in the shape of a narrow crescent.

This massive subterranean fissure is known as the "underground Grand Canyon."

This $62 million dollar temple was erected to house one little dental fragment of religious history.

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

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

This African beach is home to thousands of rare mainland penguins that are known for their annoying voice.

The supreme shrine of the state.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Macabre astrological automaton clock dating to the late 1400s.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Five miles of underground river link lake to ocean.

The stunning interior of this Gothic church is covered in ornate gold details.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

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

Thanks to a spelling mistake this bizarre beaver-tiger hybrid became the symbol of a Siberian town.

Quito's historic, main square dates back to the 16th century.

During the Soviet era, the spire of this longstanding church was used as a radio transmission tower.

Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

The Guardian of Tallinn.

These ancient monoliths make up one of the largest archaeological sites in Palau.

This beautifully restored fortification kept the city safe for centuries.

Tubing through a cave lit with glowworms is a magical underground experience.