Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

An unexpected Easter egg lurks in the background of a cherub wall relief at the Breakers mansion.

Visitors to this arboretum are greeted by three smiling giants crafted from sustainable materials.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The first declared National Monument in the United States.

An unusual geological feature towers over the remains of a dark episode in United States history.

At the time of its completion, it was the tallest dam in the world.

One man's ambition created this psychedelic log home.

The world's first nuclear power plant is open to visitors looking to role-play a meltdown.

Home to the deepest rift anywhere on Earth.

This underground cave located in the most barren reaches of Idaho is filled with ice year-round.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

The oldest still-existing mosque in the United States sits in a remote prairie in North Dakota.

The pharmacy's retro ice cream mixer is one of the last of its kind.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

An architect's childhood fantasy treehouse made real.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

This towering wooden Sasquatch was carved with a chainsaw.

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

A place of great reverence for Trekkies everywhere, a hero's future birthplace.

This art gallery and oddities boutique bewitches visitors with a trove of occult trinkets and eccentric antiques, work by an ever-changing roster of underground artists, and classes in tarot and other mystic arts.

To find the "unicorns of the deep" you've got to go downstairs.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.