Barely visible foundations remain where Stow Lake’s “observatory” once welcomed visitors.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

A rococo retro-futurist future-rustic vernacular between yesterday’s tomorrow and the future that never was.

Floating man-made island and upscale restaurant.

An essential stop before plundering, BYO Cutlass.

A 140-year-old castle with underground caves hidden in San Francisco.

Furniture tries to escape an abandoned building in San Francisco.

An artsy hidden staircase leads to breathtaking views of San Francisco.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A huge musical instrument played by the ocean.

A striking series of six bridges connect islands in Indonesia.

This rare wildlife haven in Singapore feels like you're in the tropical rainforest.

Malaysia's first and only glass temple.

Terrapins of all colors and shapes are quick to bring fascination (and possibly long life) at this museum.

A Buddhist theme park brings you a Buddhist version of Hell.

"Would you like your sangria in an IV bag, or straight-up?"

A historical convent known for taking in bad luck babies left on its doorstep is now an upscale shopping center.

A "simple-hearted artist" turned an isolated Icelandic valley into his own art museum.

A modern Nordic Pompeii on the Icelandic island of Heimaey.

Two volcanic lakes in an enormous crater formed in a prehistoric eruption.

This tumultuous Icelandic lava field looks so alien European researchers want to use it as a stand-in for Mars.

Outlaws, hot springs, and tragedy have all left their mark on this ancient road in the Icelandic highlands.

These concrete domes were installed on an Icelandic bluff to honor a very specific musical tradion.

These ominous lava formations were said to be an entrance to the netherworld so of course they inspired a famous metal band.