Freshwater ectoproct bryozoan (Cristatella mucedo) (@ Wim van Egmond/Corbis)

Freshwater ectoproct bryozoan (Cristatella mucedo) (@ Wim van Egmond/Corbis)

comments,

Astronomical clock on the Zytglogge tower in Bern, Switzerland (@ Blaine Harrington/age fotostock)

Astronomical clock on the Zytglogge tower in Bern, Switzerland (@ Blaine Harrington/age fotostock)

comments,

The twin peaks of Mount Ushba in the Greater Caucasus mountain range (@ Brooks Kraft/Corbis)

The twin peaks of Mount Ushba in the Greater Caucasus mountain range (@ Brooks Kraft/Corbis)

comments,

Interior of Graduate Reading Room at Suzzallo Library, University of Washington, Seattle (@ Michael T. Sedam/Corbis)

Interior of Graduate Reading Room at Suzzallo Library, University of Washington, Seattle (@ Michael T. Sedam/Corbis)

comments,

Aerial view of Tamul waterfall in the Huasteca Potosina region, Mexico (@ Patricio Robles Gil/Getty Images)

Aerial view of Tamul waterfall in the Huasteca Potosina region, Mexico (@ Patricio Robles Gil/Getty Images)

comments,

Candles lining a street for All Souls' Day in Kaunas, Lithuania (@ Stephane Victor/Lonely Planet Images)

Candles lining a street for All Souls' Day in Kaunas, Lithuania (@ Stephane Victor/Lonely Planet Images)

comments,

Beaded skull ornaments created for celebrations of Day of the Dead in Pátzcuaro, Mexico (@ Rodrigo Cruz/Getty Images)

Beaded skull ornaments created for celebrations of Day of the Dead in Pátzcuaro, Mexico (@ Rodrigo Cruz/Getty Images)

comments,