Covered walkway at Ta Yuan Fu, Yenching

Rock garden and covered walkway at Ta Yuan Fu, Yenching

Covered walkway at Ta Yuan Fu, Yenching

Flying corridor connecting Yan sui ge (left) and Wan fu ge (right)

Flying corridor connecting Yan sui ge (left) and Wan fu ge (right)

Exterior of Wan fu ge (right) with detail of Yan sui ge (left) and flying corridor

Flying corridor connecting Yan sui ge (left) and Wan fu ge (right)

Building details showing marble terrace and covered walkway at Yihe Yuan

Building detail showing covered walkways at Yihe Yuan

Covered walkway and half-open walkway with ornamental windows at Yihe Yuan

Pavilions, pond, and covered walkways at Xie qu yuan on Back Hill at Yihe Yuan

Mountain-climbing gallery, shoreline, and garden at Yihe Yuan

Chang lang and Kunming Lake at Yihe Yuan

Chang lang and Kunming Lake at Yihe Yuan

Chang lang with bridge in background at Yiheyuan (Summer Palace), Beijing

Staircase gallery with ornamental windows at the Old Wu Garden

Buildings and half-open covered walkway with ornamental windowns at the Old Wu Garden

Half-open staircase gallery with ornamental windows at the Old Wu Garden

Half-open staircase gallery with ornamental windows at the Old Wu Garden

Covered walkway with painted beams and cracked-ice latticework at the New Wu Garden