The resting place of a Civil War celebrity's amputated limb.

This bright yellow relic is the final survivor of a short burst of seashell-shaped petrol pumps.

The deepest metro station in the world.

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

The clock that sets them all.

Europe’s oldest natural human mummy.

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

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.

Constantly maintained, this organ is playing a six-century long composition by John Cage.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

The most accurate timepiece in the world.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.