This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

A wonderful collection of all things Oz is nestled in the heart of Kansas.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

A grove of colossal man-made flowers built to collect the sun's rays.

An abandoned stretch of elevated road in the middle of the Brazilian jungle.

An abstract monument to a symphonic composer.

An outdoor sculpture park of giant pink robots and post-apocalyptic Christmas scenes.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

A collection of housewares from recent Irish history adjoined by a tower from ancient Irish history.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

A Biblically notable site over the ruins of an ancient city that is now a protected World Heritage site.

A former Oz-themed attraction that has fallen into disrepair, but still holds some of the original magic.

A scalable map of Colombia with the bonus of a butterfly house.

An Aztec snake god has taken the material form of an apartment complex.

A 100-year-old purveyor of curiosities, curios, and kitsch featuring mummies, shrunken heads, and a Fiji Mermaid.

This 80-year old mannequin is so lifelike it is believed to be an embalmed corpse.

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

While not recognized by Guinness, this chocolate waterfall is likely to be the world's largest.

A long abandoned hospital building on the outskirts of NYC.

Smooth basaltic rocks tell a tale of ancient glacial waterfalls.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

A controversial memorial at the place where Captain Cook met his violent end.

A British pub embodies the spirit of a California legend.