(Image: Darmon Richter, The Bohemian Blog)

The latest instalment of our weekly link round-up features creepy optical illusions, urban exploration, the flu through the ages, impressive laser weapons and more.

The Flu Then & Now (Two Nerdy History Girls)

10 Incredible Real-Life Laser Weapons (Tech Graffiti)

Treasure Hide? History in Peril (National Geographic)

The Creepy Optical Illusions of Hikaru Cho (Environmental Graffiti)

Urban Exploration: The Furniture Hall, Bulgaria (The Bohemian Blog)