Blown up

Parthenon, 1687.

St Mark's Campanile (not an explosion, but a destroying implosion)

"On 16 June 1937, the bracing cables on the Getxo side were deliberately blown up in a controlled explosion,hence causing the deck to fall into the estuary and interrupting both the transporter service and maritime traffic." (Nom File) It took 4 years to bring it back into service

In 1834 Giuseppe Ferlini blew the tops of many pyramids whilst searching for treasure

Criminals used dynamite on Dabotap Pagoda within Bulguksa Temple in attempt to steal ancient artifacts. "In 1966, the monks of the temple were awakened by sounds of exploding dynamite. They discovered that thieves had attempted to blast the pagoda and steal what was hidden inside. The thieves ran away before they could steal any of the treasures but the Buddhist monks discovered precious reliquaries, sariras, and the oldest extant example of printed material from a wood block in the world." -wiki

April 3, 1856: Palace of the Grand Masters: a lightning strike set off explosions of the stored ammunition, killing 4000 people
See dailydisaster.wordpress.com

Schliemann ".. caused controversy when at one point used dynamite, including the level W, presumably the ancient Troy."
See www.thevintagenews.com

Islas Marietas: Playa Escondida (Hidden Beach): "It is rumored that the hole that created the Hidden Beach was a result of deliberate bombings. The Marieta Islands have always been completely uninhabited, making them ideal sites for military testing by the Mexican government."
See www.atlasobscura.com

Tokaj Castle demolished by the Austrians in 1705

One night in December 1704, during a very strong storm, lightning struck the Castello Maniace in Syracuse, blowing up its powder magazine (800 barrels), destroying its watchtowers, causing an entire floor to collapse and killing 33 Spanish soldiers who, as usual, garrisoned it, even at night.
See it.wikipedia.org

Ahu Vinapu was blown up with gunpowder in 1886 by a William J Thomson, purser on board the USS "Mohican". He had hoped to find a grave with valuable artifacts. In fact he only discovered stone "backfill". The highly accurately fitted stonework of Ahu Vinapu has been used as evidence of Inca influence on Rapa Nui but, as Thompson demonstrated, the stonework was only a "facing" and doesn't demonstrate any S american "connection". See
See www.osterinsel.de

Most of the statues' heads have been destroyed during the Cultural revolution.

Bamiyan buddhas, 2001