Taj Mahal in India (when visiting here it is a must see, however, India is a remarkable country with many beautiful sites to visit, try and stop in Jaipur (The Pink City), and Varanasi (The Holy City) as well
Socotra Island a place to visit in Yemen. It is famous for its biodiversity. Due to isolation and hot climate, plenty of endemic flora is found in Socotra. 307 out of the 825 plant species are indicated to be endemic (found only here).