gazebo (n.)

• alcove
• arbor
• beacon
• belvedere
• bleachers
• bower
• bridge
• conservatory
• gallery
• garden
• glasshouse
• grandstand
• greenhouse
• kiosk
• lighthouse
• lookout
• loophole
• observatory
• outlook
• overlook
• pagoda
• peephole
• pergola
• pharos
• retreat
• ringside
• summerhouse
• tower
• watchtower