A six-story-tall golden pyramid, surrounded by a moat.

Two gravestones clasp hands over the religious divide.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

At 207 feet, one of the world's longest continuous escalators.

Home to items never before seen by the public.

An original apothecary from 1792.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

This quirky curiosity shop takes its cues from the world's bazaars.

The "last unrestored grand mansion of Savannah" is now a cramped, mouldering maze of antiques.

One of the oldest living oak trees in the Southeast.

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

Amazing pre-Civil War ruins alongside a shallow, rocky river that hosts beautiful (but endangered) lilies.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

A Barbary Coast watering hole built into a Gold Rush shipwreck.

Home of modern dancer famously strangled by her own scarf.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

Hidden away in a modern library are the remains of one of the 18th century's most celebrated wunderkammers.

France's most famous cemetery, with some of its most curious tombs.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.