10. The Apeiron island hotel

Designer: Sybarite
Status: Concept
Estimated project cost: $500million

9. Foldable hotel pods

Designer: m3 Architects, London
Estimated project cost: $72 to $104 million

8. The hotel Burj al-Arab

Location: Dubai, United Arab Emirates
Designer: Tom Wright (WS Atkins PLC), Khuan Chew
Status: Complete
Estimated project cost: $650 million
Cost per person: $1,000 to over $28,000 per night, $75 to have a glimpse from inside

7. Waterworld


6. The Poseidon Undersea Resort

Location: Fiji, The Poseidon Mystery Island
Designer: Bruce Jones
Status: Under construction, will be completed by September 2008
Estimated project cost: $105 million
Cost per person: $15,000 per week

5. The Hydropolis

Location: Dubai
Designer: Joachim Hauser, Crescent Hydropolis Resorts
Estimated project cost: $500-million

4. The Lunatic Hotel

Designer: Hans-Jurgen Rombaut, Wimberly Allison Tong & Goo (WATG)
Status: Blueprint ready, will take real shape by 2050

3. Aeroscraft

Designer: Igor Pasternak (Worldwide Aeros Corporation), Wimberly Allison Tong & Goo (WATG)
Status: Prototype under development

2. Galactic Suite

Designer: Xavier Claramunt of ADD+ARQUITECTURA
Status: On hold, prototype is ready

1. Commercial Space Station Skywalker

Designer: Bigelow Aerospace, Las Vegas
Location: 515-kms above Earth
Status: The human space complex will be accessible by 2015
Estimated project cost: $500 million
Cost per person: $1 million a night