Mexico City is the capital city of Mexico and the second largest “Megacity” in the world after the Tokyo area. After centuries of pre-Columbian civilization, Spanish conquistador Hernán Cortés first arrived in the area of Mexico City in 1519. He…

The last Nuclear Power Megapost proved successful so here is another! I’ve been collating all the nuclear power themed entries since then and here are the most interesting of them. Shoreham Nuclear Power Station This is a plant that was…

This is the bizarre-looking Thames Barrier on the River Thames, London. Opened in the 1980s, the barrier is designed to protect London’s low-lying areas from flooding, and is the world’s second-largest movable flood barrier (after the Oosterscheldekering in the Netherlands…

Here you can see the shadow of one of Spain’s famous Osborne bull signs. The Osborne sherry company placed these huge silhouettes of their logo on hills near major roads throughout Spain, and although there was a law passed which…

This is the 341-year-old Kastellet in Copenhagen, Denmark – one of the best preserved fortifications in Northern Europe. King Christian IV originally had the star-shaped island built to house a castle for him to hide in (should the need arise),…

Can anyone figure out what on earth this giant egg-like thing is, near Acton, Massachusetts? Update: As ever our readers have come to the rescue, and it seems that this is the Annursnac Hill Reservoir, a covered water storage facility…