Several large-scale, eco-friendly projects at the intersection of landscape, architecture, and urbanism were honored at this year’s World Architecture Festival (WAF) in Singapore. Building of the Year was awarded to London-based Wilkinson Eyre’s Gardens by the Bay (above), designed in collaboration with landscape architects Grant Associates in 2003 for a competition to develop a reclaimed 250-acre site adjacent to a marina in downtown Singapore. Among the other top honorees were AECOM’s Heart of Doha Masterplan, winning Future Project of the Year, and Atelier Dreiseitl’s Kallang River Bishan Park, which took Landscape Project of the Year.

Gardens by the Bay wraps luscious public gardens, Mediterranean flowers, event spaces, and a 100-foot high man-made waterfall under two steel-and-glass dome-like structures, the largest climate controlled greenhouses in the world. The whimsical scheme also includes eighteen 164-foot high “Supertree” structures holding thousands of exotic plant species and connected by a series of high-tech eco-bridges that collect and re-channel rainwater to cool themselves and the adjacent greenhouses. Gardens by the Bay was completed in 2012 and has been open to the public since June.

WAF awarded Future Project of the Year to AECOM’s 77-acre Heart of Doha Masterplan in Qatar, designed as the gateway to Inner Doha and connecting the city with its waterfront as well as existing and proposed airports. Referred to by the architects as “the grid and the lattice,” AECOM superimposed an orthogonal grid onto Doha’s traditional Qatari street pattern to create a new urban structure that respects the Arab/Islamic vernacular, captures north-westerly breezes, and accommodates vehicular traffic.

The Landscape of the Year award went to landscape architects Atelier Dreiseitl for their Kallang River Bishan Park in Singapore, a project that transforms an existing, underused park and river into an ecological public space.

View all of this year’s winners at the World Architecture Festival website. Click on a thumbnail below to launch a slideshow.