July is generally not a good month to visit ancient sites. Most of them are either incredibly, unbearably hot, or totally and constantly wet. Or both. Not to mention the seething, sweating crowds of climatically confused tourists on summer holidays.
‘Lost’ Inca city, picture above. Amazingly scenic and well and mysterious old city built by the Incas on a hilltop surrounded by virgin mountains. Best: April-June, September-November. OK July, August. (winter). Avoid: December-March (rain).