It's Valentine's Day and couples and singles the world over are declaring their love in many weird and wondeful ways.

In Australia, one couple decided to climb the 440 foot high Sydney harbor bridge, to tie the knot on the most romantic day of the year. Just as they declared their un-dying love for each other, the largest cruise liner ever to visit Australia, the Queen Mary 2, arrived in the harbor, with a message for another happy couple.

A young Iranian couple look at gifts at a store in Tehran on the eve of Valentine's Day.

Over in Peru, hundreds of couples tied the knot at a mass wedding with the oldest at 80 years-old and the youngest only 17.

And in India, sales of flowers and sweets have surged as cupid's army of lovers snap up heart and rose shaped confectionary.