This elegant arc of a waterfall marks a religious turning point.

The last Victorian market in Belfast.

Belfast's namesake river still winds below the city center, hidden from sight.

For part of the year, this innovative greenhouse is painted white to keep the plants from getting scorched.

An architectural oddity hides in plain sight on this iconic London bridge.

This one has sailed five times as far as Sir Francis Drake's famous ship.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Eighty million natural history specimens call this gargantuan museum home.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

The first American department store, and home to the largest operating musical instrument in the world.

Once the private home of China’s most legendary tycoon, getting inside this stunning mansion no longer requires an elite pedigree or acts of daring.

Watch butterflies take flight before you fly.

Singapore's oldest Hindu temple.

This indoor ski resort has a mountain contained inside a mall.

Dedicated to one of the darkest moments in Irish history, this memorial has faced its fair share of backlash.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.

Ice cream stand, snack bar, and time capsule of milk conveyance.

The city of Halifax still bears the scars of the largest explosion prior to the atomic bomb.