The Bristol Camera Obscura housed in an ancient windmill.

The abandoned funicular tunnel was a secret base for the BBC during World War II.

The world's largest museum devoted solely to the whirlybird comes complete with its own chopper graveyard.

This astronomical clock is the second oldest in England.

The oldest residential street in Europe also features an optical illusion.

A repurposed railway tunnel with otherworldly acoustic characteristics.

Watch butterflies take flight before you fly.

This East End pub gained notoriety as the site where gangster Ronnie Kray publicly shot a rival.

This historic pub has maintained much of its 1906 decor, including a small sequestered room for women, where orders were slipped through a tiny window.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

Cool down and fill up after visiting Teotihuacán at this bar and restaurant in a deep, underground cave.

Thanks to a spelling mistake this bizarre beaver-tiger hybrid became the symbol of a Siberian town.

An exhibit of endangered species confiscated from smugglers and passengers.

The world's only full-size replica of the research hut used by Douglas Mawson for his 1911-14 Australasian Antarctic Expedition.

A huge stone pyramid built for fun.

This abandoned railroad tunnel is now home to a micro-colony of bats and a ghost train.

Legend says this sacred tree was a gift from goddess Athena.

An oversized Van Gogh reproduction is one of three massive sunflower paintings across the globe.

An active seahorse farm is currently saving Tasmania's handfish from extinction.

The forgotten and tragic story of the thousands of female convicts forcibly transported to Tasmania is told inside the ruins of this notorious 19th-century workhouse.

The world's first cageless zoo is working to save endangered Tasmanian devils.

A small troop of Japanese macaques live peacefully in the heart of this Tasmanian city.

This unassuming alcove in London’s famous Tower Bridge once served to capture, store, and display dead bodies from the River Thames.

A historical umbrella shop, whose owner started a craze for locally-made souvenirs.