Sources:

Itimad Ud Daulah Tomb
https://en.wikipedia.org/wiki/Tomb_of_I'tim%C4%81d-ud-Daulah
https://www.ft.com/content/44fe447a-0041-11e8-9650-9c0ad2d7c5b5
Cathedral Il Duomo di Firenze
https://en.wikipedia.org/wiki/Filippo_Brunelleschi#Florence_Cathedral
https://en.wikipedia.org/wiki/Florence_Cathedral

Borubudor Temple
http://whc.unesco.org/en/list/592
https://en.wikipedia.org/wiki/Borobudur

The Banaue Rice Terraces
https://en.wikipedia.org/wiki/Banaue_Rice_Terraces
http://www.telegraph.co.uk/travel/destinations/asia/philippines/articles/visiting-the-incredible-banaue-rice-terraces-just-got-easier/

The Ziggurat of Ur
https://en.wikipedia.org/wiki/Ziggurat_of_Ur
http://historycollection.co/5-wonders-ancient-world-youve-probably-never-heard/2/

Sigiriya Rock Fortress
https://en.wikipedia.org/wiki/Sigiriya
https://sigiriyatourism.com/

Leshan Giant Buddha
https://en.wikipedia.org/wiki/Leshan_Giant_Buddha
https://www.travelchinaguide.com/attraction/sichuan/leshan/buddha_statue.htm
http://www.chinadiscovery.com/sichuan/leshan/leshan-giant-buddha.html

Newgrange
http://www.bbc.com/travel/story/20150821-six-lesser-known-wonders-of-the-ancient-world
http://www.newgrange.com/
Calakmul
https://www.afar.com/places/zona-arqueologica-calakmul-reserva-de-la-biosfera-calakmul?context_id=lesser-known-wonders-of-the-world
https://en.wikipedia.org/wiki/Calakmul

Nan Madol
https://en.wikipedia.org/wiki/Nan_Madol
http://www.ancient-origins.net/ancient-places-asia/mysterious-ancient-coral-reef-city-nan-madol-001299
https://www.smithsonianmag.com/history/nan-madol-the-city-built-on-coral-reefs-147288758/