The breathtakingly pretty, many-pinnacled Mandir in northwest London is the largest Hindu temple outside of India. This fabulous concoction was completed in 1995, after some 5,500 tons of Italian Carrara marble and Bulgarian limestone were carved in India and assembled by volunteers. Its dome was built without using steel or lead. The interior is as white and lavishly detailed as a doily—it’s apt to amaze even people generally unimpressed by such virtuosity. Tourists are welcome—try to be there to witness the musical wick-lighting Arti ceremony at 11:45am. If you’re entering, shorts or skirts must fall at least to the knee (although ankle-length is preferable and sarongs are available to borrow); visitors must also remove their shoes.