Britannia Manor II, Austin,TX

Forbes: Homes With Outrageous Outdoor Amenities

Owned by video game developer Richard Garriott, this 4,800-square foot estate is "seeking new stewardship." Amenities of Lord Garriott's lair include a 360-degree observatory with a telescope, a lagoon, a lighted track, a grotto and this waterslide-bedecked pool with a swim tunnel that leads to an indoor pool and spa.

(Realtor.com)

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Outrageous Outdo... With the help of Realtor.com, Sotheby's International Realty, Corcoran Group and others, Forbes wrangled up a collection of for-sale homes peddling stunning outdoor amenities that make going inside unnecessary during the summer months. (Coldwell Banker Previews International)

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Icon South Beach... List Price: $19 million
Listed With: ONE Sotheby's International Realty

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Icon South Beach... This 8,000-square foot oceanfront condo has a wraparound master suite with an office and gym, but the massive roof deck might be most enticing: it hosts a private pool, an outdoor movie theater, kitchen, wet bar and billiards area. (ONE Sotheby's International Realty)

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North Coconino R... List Price: $5.85 million
Listed With: Walt Danley Realty
Source: Luxury Portfolio International

(Luxury Portfolio International)

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North Coconino R... This 10,500-square foot home has a chef's kitchen that opens out to a BBQ patio with a built-in pizza oven. The living room's telescoping doors lead to outdoor activities that include a 5-hole golf-course, two spas, and a waterpark-esque lazy river pool with stone slide.

(Luxury Portfolio International)

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Allen Street Pen... List Price: $4.97 million
Listed With: Corcoran Group

(Corcoran Group)

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Allen Street Pen... This four bedroom Manhattan condo comes with three terraces offering 360-degree views of the city and a private roof deck with jacuzzi and self-irrigating garden.

(Corcoran Group)

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Old Mill Farm, G... List Price: $33 million

Listed With: Sotheby's International Realty

(Realtor.com)

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Old Mill Farm, G... The Elizabethan-inspired Tudor formally owned by Mel Gibson sits on 75 acres that includes formal gardens, a hedge maze, a terraced pool, a tennis court with stone hut, a greenhouse, a horse stable and a giant life-sized chess set.

(Realtor.com)

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Britannia Manor ... List Price: $4.1 million
Listed With: Robin McCall CompanySource: Realtor.com

(Realtor.com)

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18 Homes With Buried Treasure
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The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.
Britannia Manor ... Owned by video game developer Richard Garriott, this 4,800-square foot estate is "seeking new stewardship." Amenities of Lord Garriott's lair include a 360-degree observatory with a telescope, a lagoon, a lighted track, a grotto and this waterslide-bedecked pool with a swim tunnel that leads to an indoor pool and spa.

(Realtor.com)

More From Forbes:
18 Homes With Buried Treasure
Mega High-Rise Mansions For Sale
Futuristic, Sci-Fi-Inspiring Homes For Sale

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.
See More Outrage... Click here to check out more homes with outrageous outdoor amenities.