Final answer:
Delos is the island where Apollo was born and is famous for its ancient sanctuary dedicated to him. The Temple of Apollo at Didyma and the Sanctuary of Asklepios on Kos exemplify the grand-scale architecture of Greek religious sites.
Step-by-step explanation:
The island famously known as the birthplace of Apollo and the site of a celebrated sanctuary is Delos. In ancient mythology, Delos was a sacred place, and temples as well as other religious structures were constructed there to honor Apollo. The Temple of Apollo at Didyma and the Sanctuary of Asklepios on Kos are examples of the grand architectural endeavors dedicated to the gods of the Greek pantheon. Such religious centers held great significance as sites where pilgrims and worshippers from far and wide would arrive to pay homage, seek oracles, or participate in rituals and festivals.