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

The ancient tomb acts as a calendar that keeps perfect time.

The largest earthwork effigy in the world.

An ancient iron pillar in Delhi that seems to be rustproof.

This plaza at the end of the world teems with monumental tributes to a problematic history, and laser discs.

Roots and stumps that lay inundated for two millennia are on display in Japan's city of three mysteries.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

Natural catch-basin rocks covered in thousands of drawings spanning many millennia.

The meteor that sealed the fate of the dinosaurs landed at this site, one of the largest impact craters in the world.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

The longest living non-clonal organisms on Earth.

The clock that sets them all.

Europe’s oldest natural human mummy.

Native Americans built this circle of stones, which was used to predict astronomical events.

Step into the cool deep past and unknown future of who begat who.

A preserved oak tree about 3,500 years old found in Riga, Latvia.

Be careful not to get trampled at this lively two thousand-year-old market.

Potential high level nuclear waste storage site for the next 10,000 years and beyond.

The closest thing to Mars on Earth.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

The world's first and only natural nuclear reactor.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.