A few years ago I started keeping track of the UNESCO World Heritage sites that I have visited. Here they are through the end of 2016. (I moved Yellowstone down the list to reflect re-visiting it.)
- Mesa Verde, USA
- Grand Canyon, USA
- Redwoods, USA
- Pueblo de Taos, USA
- Changdeokgung Palace Complex, South Korea
- City of Cuzco, Peru
- Machu Picchu, Peru
- Lima, Peru city center
- City of Quito, Ecuador
- Chichen-Itza, Mexico
- Banff & Jasper in Canada
- Great Wall, China
- Imperial Palace, China
- Temple of Heaven, China
- Longmen Grottoes, China
- Angkor, Cambodia
- Historic Center of Prague, Czech Republic
- Antigua, Guatemala
- Tikal, Guatemala
- Historic Center of Rome
- Holy See, Vatican City
- Copan Ruins, Honduras
- Þingvellir National Park, Iceland
- Orkhon Valley Cultural Landscape, Mongolia
- Victoria Falls, Zambia
- Lake Baikal, Russia
- White Monuments of Vladimir and Suzdal, Russia
- Kremlin and Red Square, Moscow, Russia
- Saint Petersburg historic sites, Russia
- Anuradhapura, Sri Lanka
- Dambulla, Sri Lanka
- Sigiriya, Sri Lanka
- Polonnaruwa, Sri Lanka
- Kandy, Sri Lanka
- Central Highlands of Sri Lanka
- Galle, Sri Lanka
- Group of Monuments at Mahabalipuram, India
- Taj Mahal, India
- Red Fort, India
- Humayun’s Tomb, India
- Agra Fort, India
- Qutb Minar, India
- Westminster Palace and Abbey, London
- Tower of London
- Churches of Moldavia, Romania
- Historic Centre of Sighișoara, Romania
- Medieval fortified churches of Transylvania.
- Historic City of Ayutthaya, Thailand
- Historic Town of Sukhothai, Thailand
- Banks of the Seine, Paris, France
- Yellowstone, USA
- Olympic National Park, USA
- Fortress of Suomenlinna, Finland
- Saint-Sophia Cathedral, Kiev, Ukraine
- Pechersk Lavra, Kiev, Ukraine
- Historic Centre of Tallinn, Estonia
- San Antonio Missions, USA (added to the list in 2015)
Again, still lots of blog posts that need to come up to bring this list even close to up to date.