These houses are worth writing home about.

Oregon resident Bruce Campbell made headlines when he decided to renovate a retired Boeing 727 and turn it into his home. But he’s not the only American choosing to live in an unconventional abode—there’s an abundance of outlandish properties procurable including cave houses and structures shaped like—wait for it—mushrooms. But, purchasing these peculiar dwellings can come at a hefty price.

According to the National Association of Realtors, 5,250,000 existing homes were sold in 2015 while the U.S. Census bureau reported that 63.7% of people in the country are homeowners.

Justin Feil of The Feil Group, top producing agents at Berkshire Hathaway in Los Angeles tells Moneyish, “With any truly unique home, when it comes to resale value, it can be a double-edged sword in the sense that those characteristics can either attract a buyer willing to pay a premium for that originality or it can backfire in the opposite direction.”

The Mushroom House, La Jolla, California
Officially named the Pavilion, this custom Dale Naegle home was built in 1968 for Sam Bell, heir to the General Mills fortune. Located on La Jolla’s Black’s Beach, the mushroom-shaped guesthouse was built with concrete walls to withstand tidal waves, rockslides and earthquakes. In August 2015, the 3 bedroom, 3 bathroom home that sits beneath a 300 foot cliff sold for $4 million to entrepreneur and retired venture capitalist Buzz Woolley.

hiddensandiego.net

Cave House, Festus, Missouri
In 2003, Curt and Deborah Sleeper made a peculiar purchase on eBay. The couple coughed up $300,000 for a 17,000 square-foot man-made cave and proceeded to build a custom home inside it. In addition to the home’s three bedrooms, two bathrooms and 30-foot ceilings, a rear chamber that once housed a roller rink still has a stage intact where it’s rumored that Ted Nugent, Bob Seger and Ike and Tina Turner have performed.

Realtor.com

Boeing 727, Portland, Oregon
Former electrical engineer Bruce Campbell had his work cut out for him when he decided to turn a $100,000 jumbo jet into his place of residence. Situated on a 10-acre lot southwest of Portland, the 1,000 square-foot aircraft boasts a futon for sleeping, a makeshift shower and see-through floor panels that look into the plane’s former cargo area. Since purchasing the Boeing 727 in 1999, Campbell has spent approximately $120,000 transforming the plane into a livable space.

Reuters/Steve Diapola

Flying Saucer House, Signal Mountain, Tennessee
Built in 1970, this round residence most recently sold to Quest Holdings LLC in 2008 for $130,900. Suspended on six concrete pillars, the out-of-this-world 2,000 square-foot spaceship-style home has three bedrooms, two bathrooms and a balcony that overlooks the wooded property.

Zillow.com

Boom Box House, Kehena, Hawaii
Designed to look like a boom box, the all-concrete Kehena Point Cliff House is actually available as a vacation rental for roughly $170 per night. But forget blasting your favorite tunes while you’re inside—its Big Island beachfront location allows for the sound of crashing waves from the home’s multiple lanais.

Vrbo.com

Shipping Container Home, Houston, Texas
These 20-foot by 8-foot shipping containers have been refurbished and turned into tiny homes complete with 160 square feet of living space. Starting at $50,000 from a company called Backcountry Containers, each custom container takes 6-8 weeks to build and includes a kitchenette and full bathroom with stall shower. The only other piece of the puzzle you’ll need to complete is finding a plot of land to house to your new tiny home.

Dome Home, El Prado, New Mexico
This 1,000 square foot dome home is constructed of Airform, steel-reinforced concrete and polyurethane foam. Two bedrooms and two bathrooms can be found inside the round residence that was on the market for $185,000 in 2016.

Zillow.com

Floating Home, Seattle, Washington
This tri-level home is permanently attached to a dock in Seattle’s Westlake neighborhood. Built in 2007, the three bedroom home also features an underwater basement with aquarium windows and most recently sold in 2011 for $2,885,000.

Pinterest.com

“From the agent standpoint, the key is to show the market why the home is of architectural or artistic significance—that it’s truly one-of-a-kind and there is nothing else out there quite like it,” says Feil.