The remains of a convent turned military barrack in the heart of Madrid.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

An ancient capital city that dates back 3,000 years and harbors many surprises.

A more chill but no less fascinating version of the famous ancient archeological site.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

This electric green sulphur lake in New Zealand looks like a cartoonish radioactive dump site.

Eat your Big Mac in a DC-3.

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

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

The accidental discovery of this gilt bronze head led archaeologists to find the Roman Baths in the city of Bath

Everyday, fans from across the globe visit the statue of one of the greatest Formula One drivers in history.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

An overlooked memorial honoring the local Washington residents who died in World War I.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Towering earthen formations that rise straight out of the ground in New Zealand .

A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.

This preserved village shows the modest lifestyles of the area's 19th-century Chinese gold miners.

A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.

The platform atop this verdant volcano was built with the help of a royal elephant.

Handcrafted thermal spa washes away each night with the tide.

This incredible narrow-gauge mountain railway was created by a ceramic artist.

This exceptionally well-preserved ancient marvel also houses a small museum dedicated to Jordanian folk tradition.