This equinox is one of only two days in the year when the Sun crosses the celestial equator, meaning that both day and night last for 12 hours.
As the largest Maya temple in the pre-Columbian city of Chichén Itzá, El Castillo rises some 98 feet above Mexico's Yucatan jungle.
Pulled and dragged more than 150 miles from Presley Hills in Pembrokeshire in Wales, the huge slabs of rock that make up Britain's most embolic stone circle.