The sign at the garden gate reads: "These Plants Can Kill."

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

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

An exquisite tunnel of cascading flowers.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

Owned by no one but beloved by all, Brownie was a good dog.

Hundreds of hopeful gold miners came here to get rich, but only two years later the small town was deserted.

Unusual hexagonal rocks formed by cooling lava named for their resemblance to traditional Japanese tatami mats.

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

A "sinister, whimsical, tacky, and really orange" public art installation hidden under a Seattle bridge.

A cave in southern Italy adorned with thousand-year-old Biblical frescoes existed in obscurity until fairly recently.

One of only two places in the world where two rivers cross each other without the waters mixing.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

The oldest operating pharmacy in the world features 800-year-old recipes.

A kaleidoscopic warehouse-maze of handmade neon signs.

This subterranean disco dance club in a Cuban cave comes with bright lights and a dark legend.

Former WWI oil tanker played a variety of roles in history, its tantalizing rum-flavored scent being the only constant.

This 700-year-old street food market features baby octopus and soy donuts.

Mexico's first public cable car soars over the congested streets outside Mexico City.

Visitors come from all over to bring gifts and tokens to the grave of Alice, who is thought to have died of a broken heart.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

The island of Lanai in Hawai'i is a paradise for cats and cat lovers.