One of the World's Greatest Wonders, $42.50 (1909)

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OMG I've been there!  I had no idea there were tours back in 1909.  SUCH a fun place.

Now seems like a good time to go, too:

http://www.hawaiimagazine.com/blogs/hawaii_today/2012/10/22/Hawaii_Kilauea_volcano_lava_lake

http://www.hawaiinewsnow.com/story/19905567/lava-lake-reaches-record-level-at-halemaumau



And if your computer can handle it (be careful!), here's a SUPER HI RES 14,755 x 3465 px image of the caldera.