The Royal Mail used to run it's own London Underground, but apart from the odd VIP travelling in secret, the only passengers were letters and small parcels.
Found all over the world, some tree frogs provide poison for darts, while in one species you can see the heart beating as it's skin is see-through.
John F Kennedy showed he was a charismatic US president and global visionary from the moment he took to the podium to deliver his inauguration speech.
Vincent van Gogh's stunning paining Summer Evening Wheatfield with setting sun was inspired by mans labours working with natures natural cycle of life.
The River Danube is undoubtedly one of the most famous stretches of water in the entire world. Here's what you might not know about this majestic river of Europe.