A library where thousands of books explain how to avoid another Great Recession.

An impressive century-old, to-scale topographical map of Guatemala.

This unique building in the main square stands out among the city's typically Baroque architecture.

A curious collection of oddities including a lock of Alexander Hamilton's hair and Harry Houdini's ouija board.

A remarkable lava formation encloses a line of Buddhist statues that can't be accurately counted, according to local mythology.

A vast necropolis where you'll find the elaborate mausoleums of Argentinian tango stars.

An airy Art Deco space devoted to the weird and wonderful folk art traditions of Mexico.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

A perfectly circular lake is formed by the crater of an ancient underwater volcano.

An unusual and powerful memorial in which earthquake victims are remembered by empty white chairs.

A secret garden in a picturesque Edinburgh village has inspired artists for centuries.

This mysterious underground cave in Shropshire dates back to the 18th or 19th century.

One of the world's tallest waterfalls wasn't revealed to the world at large until 2006.

The "world's smallest volcano" has been used to store meals and dispose of dead bodies.

Just another ancient, mysterious Irish stone circle.

A secret hatch containing two parchments was discovered in this statue over 40 years after its installation.

Come to this Polish museum to take a good, clean look at filth.

This seaside production studio was built to film 'Titanic' and has been the wet set of choice for other Hollywood productions since.

An 18th-century lighthouse built on a 16th-century castle is now a monument to the maritime beacons of Scotland.

A 1950s eccentric's vision of Eden preserved as a hiking trail.

The ruins of a once-grand mansion in Northern Ireland are now thought to be haunted.

Two churches shoot bottle rockets at each others' bell towers in an unusual Easter celebration.

This heart-shaped island looks substantially less lovely after a recent bulldozing project.

"Holy Wisdom" overlooks the city that became its namesake.