San Francisco's newly reopened hands-on science museum.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

This gem is often wrongly overshadowed by the larger, newer Metropolis church in Athens.

Where commuters walk through remnants of an ancient Greek necropolis.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

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

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

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

Colorful umbrella-covered trees in Singapore's Little India look straight out of Dr. Seuss.

A tall karst islet popularized by 007.

A hugely vast Irish landscape of barren rock that stretches for miles.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

Race through the maze, get your name on the sign.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

A former imperial sea-fortress and Soviet prison.

A nuclear bunker built to shelter the politicians and important people of Scotland in case of nuclear attack.