Established in 1887, it was the first national park in New Zealand and is recognised as a UNESCO World Heritage Site. The park is home to three active volcanoes - Mount Tongariro, Mount Ngauruhoe, and Mount Ruapehu.

You might also recognise a few spots here from LOTR, there is various places throughout the park where filming took place, I've listed a couple below.

Tukino Ski Field, Mount Ruapehu: Frodo, Sam and Gollum look out over the Gates of Mordor before setting out to climb around them.

• 39° 16.667'S 175° 36.626'E - view in Google maps  

Mount Doom - Mount Ngauruhoe

Mangawhero River: Frodo and Sam pass a ruined column in a clearing

• 39° 19.217'S 175° 30.315'E - view in Google maps

Whakapapa skifield: Isildur cuts off Sauron's finger and the Ring.

• View of location: 39° 14.116'S 175° 33.529'E - view in Google maps

• Location: 39° 14.114'S 175° 33.522'E - view in Google maps

Whakapapa skifield: Frodo and Sam catch Gollum. Gollum leads the hobbits down the Emyn Muil.

• 39° 14.177'S 175° 33.670'E - view in Google maps
  

Tawhai Falls - Gollum's Pool!