In the northern hemisphere, it's the season for building things out of snow and ice — including enormous castles and buildings. Here are some of the most impressive.

The first ice palace, built in St. Petersburg, Russia for Empress Anna Ivanovna as a part of the celebration of Russia's victory over the Ottomans in 1739-1740.

It was designed by Pyotr Yeropkin with a garden filled with an elephant, birds and trees, all of them made from ice.

The Most Magnificent Ice Castles in the WorldS

(via State Russian Museum/Wikimedia Commons)

The Indian New Deal Ice Palace near Lake Bemidji, Minnesota, 1934

The Most Magnificent Ice Castles in the World

(via Wikimedia Commons/Franklin D. Roosevelt Presidential Library and Museum)

The Carnaval de Québec ice palaces, Québec, Canada

The Most Magnificent Ice Castles in the WorldS

The Most Magnificent Ice Castles in the WorldS(via Carnaval de Québec)

The 1986 Saint Paul Winter Carnival ice palace in Saint Paul, Minnesota

The Most Magnificent Ice Castles in the WorldS

(via Saint Paul Almanac)

The world's first ice hotel, the ICEHOTEL in Jukkasjärvi, Sweden, opened in 1990. Every furniture its is made of snow and 100,000 tons of ice taken from the nearby river.

The Most Magnificent Ice Castles in the WorldS

The Most Magnificent Ice Castles in the WorldS

The Most Magnificent Ice Castles in the WorldSThe Most Magnificent Ice Castles in the WorldS

The Most Magnificent Ice Castles in the WorldS

The Most Magnificent Ice Castles in the WorldS The Most Magnificent Ice Castles in the WorldS

The Most Magnificent Ice Castles in the WorldS

(via bjaglin, azedkae, Oceans of Lilim, Jörgen Bengtson and Wikimedia Commons)

The SnowCastle of Kemi in Finland, the biggest snow castle in the world, rebuilt every winter since 1996 on an area between 13,000 and 20,000 sqm with 65ft (20 m) high and 3,280 ft (1000 m) long walls.

The Most Magnificent Ice Castles in the WorldSThe Most Magnificent Ice Castles in the WorldSThe Most Magnificent Ice Castles in the WorldSThe Most Magnificent Ice Castles in the WorldSThe Most Magnificent Ice Castles in the WorldSThe Most Magnificent Ice Castles in the WorldSThe Most Magnificent Ice Castles in the WorldS

(via Kemin LumiLinna/Facebook and Elissa Ernst/Flickr)

The Ice Hotel with a small chapel for weddings, near Quebec City (Hôtel de Glace), Canada, made with 15,000 tons of ice, opened in 2001

The Most Magnificent Ice Castles in the WorldS

The Most Magnificent Ice Castles in the WorldS

The Most Magnificent Ice Castles in the WorldS

The Most Magnificent Ice Castles in the WorldS

The Most Magnificent Ice Castles in the WorldS

The Most Magnificent Ice Castles in the WorldS

The Most Magnificent Ice Castles in the WorldS

The Most Magnificent Ice Castles in the WorldS

(via Chensiyauan/Wikimedia Commons and Hôtel de Glace/Facebook)

Huge ice buildings, some of them with colored lights at the 22th Harbin Ice Lantern Art Festival in Harbin, China, December 2002

The Most Magnificent Ice Castles in the WorldS

The Most Magnificent Ice Castles in the WorldSThe Most Magnificent Ice Castles in the WorldSThe Most Magnificent Ice Castles in the WorldSThe Most Magnificent Ice Castles in the WorldS

(via AP/Li Yong/XINHUA and Cancan Chu/Getty Images)

The copy of the first ice palace built in 1739 in Palace Square, St. Petersburg, opened in 2006

The Most Magnificent Ice Castles in the WorldS

The Most Magnificent Ice Castles in the WorldS

The Most Magnificent Ice Castles in the WorldS

(via Dmitry Lovetsky/AP)

Tourists view ice buildings and a maze in the Grand Ice and Snow World at 23rd Harbin International Ice and Snow Festival in Harbin, China, January 2007

The Most Magnificent Ice Castles in the WorldS

(via Cancan Chu/Getty Images)

The Mario-inspired castle in Michigan Technological University's Winter Carnival in Houghton, Michigan, 2010

The Most Magnificent Ice Castles in the WorldS

(via Wikimedia Commons/MIT)

The ICIUM Wonderworld of Ice in Levi, Finland, opened in December 2010. There are ice and snow sculptures and buildings in an area of 2.5 acres (1 ha).

The Most Magnificent Ice Castles in the WorldS
The Most Magnificent Ice Castles in the WorldS
The Most Magnificent Ice Castles in the WorldS
The Most Magnificent Ice Castles in the WorldS
The Most Magnificent Ice Castles in the WorldS
The Most Magnificent Ice Castles in the WorldS
The Most Magnificent Ice Castles in the WorldS

(via ICIUM)

Colorful buildings made from blocks of ice at Harbin International Ice and Snow Festival, Harbin, China, January 2012

The Most Magnificent Ice Castles in the WorldS

The Most Magnificent Ice Castles in the WorldS

The Most Magnificent Ice Castles in the WorldS

(via AP/Andy Wong)