The Trevi Fountain, the Leaning Tower of Pisa, the Charles Bridge — these are all hugely popular tourist destinations that ...

Watch the crescent moon, Venus and the bright star Regulus align in a rare predawn close conjunction tomorrow.

The F.A.A. allows many of these popular flights to operate under less stringent rules than other commercial aviation, opening the door to dangers like pilot fatigue. By Christine Chung The deadly ...