The most interesting prisons on earth

1. world’s most valuable prison
san quentin state prison, california
capacity: 3317

2. world’s smallest prison
sark prison, sark, guernsey
capacity: 2

3. world’s most secure prison
adx supermax, florence, colorado
capacity: 550

4. world’s strangest prison
san pedro, bolivia
capacity: 800

5. world’s best-looking prison
leoben justice centre, steiermark, austria
capacity: 205

6. world’s most famous prison
alcatraz / the rock, san fransisco bay, california
capacity: 336

7. world’s most overcrowded prison
kresty prison, st. petersburg, russia
official capacity: 3,000
actual population: always at least 10,000