The coolest buildings used to have sharp angles and straight lines — but nowadays, a lot of the world's most beautiful structures are entirely round. Here are the most beautiful and impressive circular buildings of the 21st century.

The 25-floor Fang Yuan Building, an office building in Shenyang, China, completed in 2001.

(via imgur and Matthias Schröder)

Bibliotheca Alexandrina, Alexandria, Egypt, designed by Snøhetta Architects and Hamza Associates, 2002

(via e-architect, M.A. Ghanem and carnegie)

The 285 ft (87 m) all-glass Radisson BLU hotel in Frankfurt am Main, Germany, constructed between 2003 and 2005, designed by John Seifert

(via Wikimedia Commons)

Shabyt (Palace of Creativity, but also known as the Dog Bowl), Astana, Kazakhstan

Tietgen Dormitory, Copenhagen, Denmark, by Lundgaard & Tranberg Architects, 2006

(via Lundgaard & Tranberg Architects)

Placebo Pharmacy, Athens, Greece, designed by KLab Architecture, 2009

(via ArchDaily)

Al Dar Headquarters, a 23-floor and 407 ft (124 m) tall building in Al Raha, Abu Dhabi, United Arab Emirates, designed by MZ Architects, constructed between 2007 and 2010

(via ArchDaily, Jon Connell and Ahmed Al Harthi)

Emergency And Infectious Diseases Unit of Skåne University Hospital, Malmö, Sweden, designed by C.F. Møller and Link Arkitektur, built between 2006 and 2011

(via C.F. Møller and Designboom)

Alesia Museum, Alise-Sainte-Reine, France, by Bernard Tschumi Architects, 2012

(via ArchDaily)

The 33-floor (453 ft or 138 m tall) Guangzhou Circle in Guangzhou, Guangdong, China, designed by AM Projects Milan, built between 2010 and 2014. It's the new headquarters of the Guangdong Plastics Exchange, and looks remarkably like an antique Chinese copper coin.

(via llee_wu 12 and 準建築人手札網站 Forgemind ArchiMedia)