Peanut butter trees and miracle berries are just the beginning.

The 25-million-year-old cavities have perplexed people for decades.

The longest manmade tunnel in Queensland is now a beautiful trail, home to a special colony of bent-wing bats.

A tunnel with windows, so you don't miss out on the impressive views.

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

An otherworldly alpine pasture with its own unique microculture that recalls Middle Earth.

Named for the 39 tribes that live in Oklahoma, this restaurant's menu deliciously highlights local flavors.

Mysterious chains and iron stakes adorn this strange grave, with no explanation.

According to local legend, a tree grew from the stake that killed this alleged vampire. In reality, he probably died from influenza.

From a supper club to a gay bar to an HBO shooting location, this 125-year-old Victorian mansion has lived many lives.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Don't be surprised if you see a long-necked dinosaur peeking out from among the trees in Northgate Park.

This quirky little private museum is home to more than a thousand stones, carved by nature, that resemble human faces.

Renowned restaurant tucked in a cave once occupied by buccaneers.

Eat a Nobel banquet from any year in the basement of Stockholm's City Hall.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

A watering hole where the options for seating include a bar, patio, or subterranean cave.

A 115-year-old restored German dining hall awaits those who venture beneath the Minnesota State Capitol.

You'll need cowboy boots to trek to this old-fashioned saloon nestled in a giant natural cave.

A basement pool hall is the front for some of the best Dominican food in New York City.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

Drink and dine in a coral cave that's at least 120,000 years old.

One of the oldest lighthouses in the world has been in continuous use since it was first built in 1531.

The oldest stone house in Paris was built by its most famous alchemist.