I visited the botanical garden of Sapienza University of Rome in December 2023. It is located in Trastevere.
I visited Bulguksa and Seokguram, Gyeongju in July 2023. This is a view from just outside Seokguram.
I visited Tadeiyama Kofun in Sakai, Osaka in March 2022. It is 110 meters wide and 148 meters long.
I visited ICC, CHARUSAT, Changa, Gujarat in December 2019. An interesting picture is painted on the entrance floor of the building.
I visited Valencia, Spain in July 2019. I visited Príncipe Felipe Science Museum there to attend a conference dinner.
I visited Kyoto in May 2018. I took a photo of the southern view of Kamo River from Nijo Ohashi.
I stayed at CENTRA, IST, Lisbon in October 2017 for a month with the support of Rikkyo University International Academic Research Exchange Programme. I gave a talk to the gravity group there on primordial black holes on 19th of October 2017.
This is a 22 degree halo around the Sun. I observed it and took this photo at Miurakaigan station on the 8th of September 2016 in the institute's summer school.