In 2019 visits are by appointment only at Machu Picchu, Peru. Arrival within an hour of the set time is a must and a visit cannot last longer than four hours.
A sayonara tax went into effect on January 7th in Japan. You can expect to pay around £10 on leaving, and the fee is automatically added to air and cruise fares.
Skellig Michael in Ireland was popularised by Star Wars as Luke Skywalker appeared there in the Force Awakens so now there is a daily cap on visitors.