The collection of intricate sculptures includes one carved from a mammoth's tusk

A fabulously bizarre surrealist sculpture by the late artist Leonora Carrington.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

At a museum of everyday objects, it is the act of collecting that is really on display.

The only castle in North America to ever house European sovereigns.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

66,000 pieces of art, donated by one of the world's richest men.

The same water that fills a luxury resort’s pools feeds these free hot springs in the rainforest.

The remnants of a creative early method of wildfire prevention.

In paradise, feral pigs have claimed an island all to themselves.

This Arkansas town is known for its gangster history, its healing waters, and now its brews.

The seventh largest spring in the world.

Two gushing waterfalls of hot spring water within a block of each other.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

An abandoned 1970s theme park that has been turned into a space for waterfront walking.

This coastal port saw one of the most significant battles of the Civil War.

Once a bustling cotton factory, this early 20th-century building is now home to a thriving artspace.

This Tennessee museum is dedicated to a tragic railroad hero who inspired the famous ballad that bears his name.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.