Curious, odd, weird ... when those adjectives are used to describe architecture you know you're in for something out of the ordinary. There are plenty of architectural oddities all over the USA. Here's one for each state:
Petty-Beatty-Roberts House, Clayton
The Dr. Seuss House, Willow
Chapel of the Holy Cross, Sedona
Thorn Crown Chapel, Eureka
Cabazon Dinosaurs, Palm Springs
Bishop Castle, Rye
Gillette Castle, East Haddam
Futuro House, Milton
Bok Tower, Lake Wales
Pasaquan, Buena Vista
Dog Bark Park Inn, Cottonwood
Raven's Grin Inn, Mount Carroll
Rotary Jail, Crawfordsville
Castle of Ida Grove, Ida Grove
Garden Eden, Lucas
Boudurant's Pharmacy, Lexington
Myrtle's Plantation, St. Francisville
Nervous Nellie's Jams and Jellies, Deer Isle
Enchanted Forest Amusement Park, Ellicott City
Stata Center, Cambridge
Earl Young Mushroom Houses, Charlevoix
Weisman Art Museum, Minneapolis
Mammy's Cupboard, Natchez
Cementland, St. Louis
Anaconda Smelter Stack, Anaconda
Maskell City Hall, Maskell
Thunder Mountain Monument, Imlay
America's Stonehenge, Salem
Lucy the Elephant, Margate City
Atlas-I, Albuquerque
Decoy Townhouse, Brooklyn
Castle Mont Rouge, Rougemont
Stanley R. Mickelsen Safeguard Complex, Williston
Longaberger Headquarters, Newark
The Bavinger House, Norman
Hot Lake Hotel, LaGrande
Haines Shoe House, Hallam
Fleur de Lys Studio, Providence
Atalaya Castle, Murrells Inlet
Corn Palace, Mitchell
The Spaceship House, Signal Mountain
Superconducting Super Collider, Waxahachie
Mars Analogue Research Station, Hanksville
The Dog Chapel, St. Johnsbury
The Markell Building, Richmond
Experience Music Project, Seattle
New Vrindaban Palace of Gold, Moundsville
The House on The Rock, Dodgeville
Smith Mansion, Wapiti Valley