A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

A crumbling hospital from the 1850s on Roosevelt Island.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

The oldest living tree in Manhattan comes shrouded in sinister legend.

Manhattan's deadly West Side railroad, which killed hundreds of New Yorkers, is remembered by this simple plaque.

130 replicas of world wonders squeezed into just 118 acres of space.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

Yo, Adrian!

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

This elaborate towering structure was once famed for its revolutionary height.

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

Huge masonic hall in Philadelphia with lavishly themed rooms.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

The largest volcanic caldera in Japan holds an entire city in its maw.

Peace Park and the Atomic Bomb Dome.

This Japanese national treasure was originally built in 593.

This enormous "shamoji" means more to the people of Miyajima than just a way getting rice onto a plate.

The 10,000 Torii shrine.

A bronze statue dating back as far as 1252, still has remnants of gold on its right cheek from ancient gilding.

This little replica of Lady Liberty provides a bit of NYC in a Japanese city.

A magical place that lets you play in and explore the world of Studio Ghibli.

The world's longest outdoor escalator takes visitors to the top of China's largest dam and is also shaped like a dragon.