An old-timey peepshow allows visitors to gawk at some of the world's most freakishly large footwear.

A museum dedicated to the history and exploration of both popular music and science fiction.

An ancient system of freshwater caves filled with animal bones, including that of species long-extinct.

A flooded Mexican cave that hides a river beneath the water.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

When flour explodes, it's not a pretty sight.

The "lovely red Vega" of the legendary record-settling pilot.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

A haunting tribute to pioneering photographer Clover Adams.

The most decorated dog of World War I is preserved in the Smithsonian.

Museum housed in underground tunnels that date back to Buenos Aires's earliest settlements.

A beautiful young girl said to have been buried alive in her coffin…

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

Visit the WWII bunker where the British won the battle for the skies.

Hidden in plain sight, this creepy sculpture watches from above.

Hear the quietest sound from across the dome.

Shiny Brutalist box commemorates a pioneer of electricity and houses a railway transformer.

Two plaques commemorate the site of Shakespeare's first theatre.

A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The Habsburgs' royal collections of art and wonders.